From pablo at parobalth.org  Tue Aug 11 09:07:14 2020
From: pablo at parobalth.org (Pablo Rath)
Date: Tue, 11 Aug 2020 10:07:14 +0200
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
Message-ID: <20200811080714.rxvfx5eiqdopv2ei@pabbook>

On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton wrote:
> On Sunday, July 26, 2020, Pablo Rath <pablo at parobalth.org> wrote:
> 
> 
> >
> > I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from
> > an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB
> > socket.
> 
> 
> ok you need... a male to male cable.
> 
> 
> > Can I use one of them with a standard USB 2.0 USB A to USB A (male to
> > male) cable?
> 
> 
> yes that's the one.  usually used on laptop fan bases.
> 

Bought and tried the cable but I have no working UART. 
So far I have tried both USB-ports on the Micro Desktop, powering with
the USB-port of my laptop and with the power supply (Output 5V, 2A). 
I think that the cable is working because it is new and it can load my
smartphone (with an additional USB-OTG female USB to Micro USB adapter). 
Is there anything else I can try?
It is frustrating. Without UART connection I don't know if anything
happens at all when connecting the USB cable to the Micro Desktop.

Pablo


From pablo at parobalth.org  Tue Aug 11 09:31:02 2020
From: pablo at parobalth.org (Pablo Rath)
Date: Tue, 11 Aug 2020 10:31:02 +0200
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <20200811080714.rxvfx5eiqdopv2ei@pabbook>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
Message-ID: <20200811083102.eabgjasqe7whq7y5@pabbook>

On Tue, Aug 11, 2020 at 10:07:14AM +0200, Pablo Rath wrote:
> On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton wrote:
> > On Sunday, July 26, 2020, Pablo Rath <pablo at parobalth.org> wrote:
> > 
> > 
> > >
> > > I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from
> > > an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB
> > > socket.
> > 
> > 
> > ok you need... a male to male cable.
> > 
> > 
> > > Can I use one of them with a standard USB 2.0 USB A to USB A (male to
> > > male) cable?
> > 
> > 
> > yes that's the one.  usually used on laptop fan bases.
> > 
> 
> Bought and tried the cable but I have no working UART. 
> So far I have tried both USB-ports on the Micro Desktop, powering with
> the USB-port of my laptop and with the power supply (Output 5V, 2A). 
> I think that the cable is working because it is new and it can load my
> smartphone (with an additional USB-OTG female USB to Micro USB adapter). 
> Is there anything else I can try?
> It is frustrating. Without UART connection I don't know if anything
> happens at all when connecting the USB cable to the Micro Desktop.
> 
Sorry, forgot to add that I tested my USB TTl to serial adapter with
another arm-board and confirmed it working.

Pablo


From crimier at yandex.ru  Tue Aug 11 10:36:00 2020
From: crimier at yandex.ru (=?utf-8?B?UGnEjXVnaW5zIEFyc2VuaWpz?=)
Date: Tue, 11 Aug 2020 12:36:00 +0300
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <20200811083102.eabgjasqe7whq7y5@pabbook>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<20200811083102.eabgjasqe7whq7y5@pabbook>
Message-ID: <996321597138461@mail.yandex.ru>

11.08.2020, 11:32, "Pablo Rath" <pablo at parobalth.org>:
> On Tue, Aug 11, 2020 at 10:07:14AM +0200, Pablo Rath wrote:
>>  On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton wrote:
>>  > On Sunday, July 26, 2020, Pablo Rath <pablo at parobalth.org> wrote:
>>  >
>>  >
>>  > >
>>  > > I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from
>>  > > an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB
>>  > > socket.
>>  >
>>  >
>>  > ok you need... a male to male cable.
>>  >
>>  >
>>  > > Can I use one of them with a standard USB 2.0 USB A to USB A (male to
>>  > > male) cable?
>>  >
>>  >
>>  > yes that's the one. usually used on laptop fan bases.
>>  >
>>
>>  Bought and tried the cable but I have no working UART.
>>  So far I have tried both USB-ports on the Micro Desktop, powering with
>>  the USB-port of my laptop and with the power supply (Output 5V, 2A).
>>  I think that the cable is working because it is new and it can load my
>>  smartphone (with an additional USB-OTG female USB to Micro USB adapter).
>>  Is there anything else I can try?
>>  It is frustrating. Without UART connection I don't know if anything
>>  happens at all when connecting the USB cable to the Micro Desktop.
>
> Sorry, forgot to add that I tested my USB TTl to serial adapter with
> another arm-board and confirmed it working.
>
> Pablo
>

Hi! I have an EOMA board + microdesktop PCB that's currently set up to be power-able, and I can test things on a known-working board. Are you using some kind of SD card image that I could download for testing, or just the EOMA PCB + desktop card without any image-containing MicroSD card?

Cheers!
Arsenijs


From lkcl at lkcl.net  Tue Aug 11 11:37:41 2020
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Tue, 11 Aug 2020 11:37:41 +0100
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <20200811080714.rxvfx5eiqdopv2ei@pabbook>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
Message-ID: <CAPweEDzVLBG7JSV7k_uHnsLWaeMz-Ce-m6p2BW3yw1-qB27ORg@mail.gmail.com>

On Tuesday, August 11, 2020, Pablo Rath <pablo at parobalth.org> wrote:

> On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton
> wrote:
> > On Sunday, July 26, 2020, Pablo Rath <pablo at parobalth.org> wrote:
> >
> >
> > >
> > > I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from
> > > an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB
> > > socket.
> >
> >
> > ok you need... a male to male cable.
> >
> >
> > > Can I use one of them with a standard USB 2.0 USB A to USB A (male to
> > > male) cable?
> >
> >
> > yes that's the one.  usually used on laptop fan bases.
> >
>
> Bought and tried the cable but I have no working UART.
> So far I have tried both USB-ports on the Micro Desktop, powering with
> the USB-port of my laptop and with the power supply (Output 5V, 2A).
> I think that the cable is working because it is new and it can load my
> smartphone (with an additional USB-OTG female USB to Micro USB adapter).
> Is there anything else I can try?
> It is frustrating. Without UART connection I don't know if anything
> happens at all when connecting the USB cable to the Micro Desktop.


does the USB UART happen to be one which has flashing LEDs on it?

there is another way to power the Card: *carefully* plug in a USB-OTG cable.

however the SY6280 should prevent power getting back through to the Housing.

it will however not prevent the 3.3v Tx and Rx of the UART from lighting up.

if the SY6280 was damaged at the time then it will not be letting power
through to the Card.

therefore powering via USB-OTG will bypass that.

l.



-- 
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

From lkcl at lkcl.net  Tue Aug 11 11:50:02 2020
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Tue, 11 Aug 2020 11:50:02 +0100
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <996321597138461@mail.yandex.ru>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<20200811083102.eabgjasqe7whq7y5@pabbook>
	<996321597138461@mail.yandex.ru>
Message-ID: <CAPweEDxK1kiDiUHGviGAq8URAEcKVF2ZkUg7nT8CE3G0nHexyw@mail.gmail.com>

On Tuesday, August 11, 2020, Pičugins Arsenijs <crimier at yandex.ru> wrote:


> Hi! I have an EOMA board + microdesktop PCB that's currently set up to be
> power-able, and I can test things on a known-working board. Are you using
> some kind of SD card image that I could download for testing, or just the
> EOMA PCB + desktop card without any image-containing MicroSD card?


he's got things built and documented it here:
http://rhombus-tech.net/allwinner_a10/Building_Linux/

somewhere i have a .tgz of the first partition and early parts of the raw
disk image.  it *might* be here:

http://hands.com/~lkcl/eoma/a20/
http://lkcl.net/eoma68-a20



the operating system can be constructed with debootstrap of armhf foreign
arch, which is very well documented on the debian wiki and many other places

https://wiki.debian.org/ArmHardFloatChroot

l.



-- 
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

From pablo at parobalth.org  Tue Aug 11 12:34:45 2020
From: pablo at parobalth.org (Pablo Rath)
Date: Tue, 11 Aug 2020 13:34:45 +0200
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <CAPweEDzVLBG7JSV7k_uHnsLWaeMz-Ce-m6p2BW3yw1-qB27ORg@mail.gmail.com>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<CAPweEDzVLBG7JSV7k_uHnsLWaeMz-Ce-m6p2BW3yw1-qB27ORg@mail.gmail.com>
Message-ID: <20200811113445.ulco2jfcgmmr7ejl@pabbook>

On Tue, Aug 11, 2020 at 11:37:41AM +0100, Luke Kenneth Casson Leighton wrote:
> On Tuesday, August 11, 2020, Pablo Rath <pablo at parobalth.org> wrote:
> 
> > On Sun, Jul 26, 2020 at 10:29:07PM +0100, Luke Kenneth Casson Leighton
> > wrote:
> > > On Sunday, July 26, 2020, Pablo Rath <pablo at parobalth.org> wrote:
> > >
> > >
> > > >
> > > > I have a power supply from a Huawei Tablet (Output 5V, 2A) and one from
> > > > an old Ipad Mini (Output 5V, 1A) both with a wall plug and a female USB
> > > > socket.
> > >
> > >
> > > ok you need... a male to male cable.
> > >
> > >
> > > > Can I use one of them with a standard USB 2.0 USB A to USB A (male to
> > > > male) cable?
> > >
> > >
> > > yes that's the one.  usually used on laptop fan bases.
> > >
> >
> > Bought and tried the cable but I have no working UART.
> > So far I have tried both USB-ports on the Micro Desktop, powering with
> > the USB-port of my laptop and with the power supply (Output 5V, 2A).
> > I think that the cable is working because it is new and it can load my
> > smartphone (with an additional USB-OTG female USB to Micro USB adapter).
> > Is there anything else I can try?
> > It is frustrating. Without UART connection I don't know if anything
> > happens at all when connecting the USB cable to the Micro Desktop.
> 
> 
> does the USB UART happen to be one which has flashing LEDs on it?
> 
No. There are no LEDs on it.

> there is another way to power the Card: *carefully* plug in a USB-OTG cable.
> 
> however the SY6280 should prevent power getting back through to the Housing.
> 
> it will however not prevent the 3.3v Tx and Rx of the UART from lighting up.
> 
> if the SY6280 was damaged at the time then it will not be letting power
> through to the Card.
> 
> therefore powering via USB-OTG will bypass that.

Ok. I have tried that now. Pressed "2" while applying power over USB-OTG
but an Allwinner USB FEL device is not found with 'sunxi-fel version'.
Also tried to boot with my known working µSD-Card but there is no output
on UART.

Pablo


From pablo at parobalth.org  Tue Aug 11 12:38:54 2020
From: pablo at parobalth.org (Pablo Rath)
Date: Tue, 11 Aug 2020 13:38:54 +0200
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <996321597138461@mail.yandex.ru>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<20200811083102.eabgjasqe7whq7y5@pabbook>
	<996321597138461@mail.yandex.ru>
Message-ID: <20200811113854.h7pzuj7nblosnmqx@pabbook>

> 
> Hi! I have an EOMA board + microdesktop PCB that's currently set up to be power-able, and I can test things on a known-working board. Are you using some kind of SD card image that I could download for testing, or just the EOMA PCB + desktop card without any image-containing MicroSD card?
> 
Thank you for your offer to help. I have a known working SD card image
but if I can't get UART to work I can't see early boot console output
(U-Boot and Kernel) and can not contribute much at this stage of the
project.

Pablo


From pablo at parobalth.org  Tue Aug 11 12:44:50 2020
From: pablo at parobalth.org (Pablo Rath)
Date: Tue, 11 Aug 2020 13:44:50 +0200
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <CAPweEDxK1kiDiUHGviGAq8URAEcKVF2ZkUg7nT8CE3G0nHexyw@mail.gmail.com>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<20200811083102.eabgjasqe7whq7y5@pabbook>
	<996321597138461@mail.yandex.ru>
	<CAPweEDxK1kiDiUHGviGAq8URAEcKVF2ZkUg7nT8CE3G0nHexyw@mail.gmail.com>
Message-ID: <20200811114450.u2dbryuzrbqyvj2t@pabbook>

On Tue, Aug 11, 2020 at 11:50:02AM +0100, Luke Kenneth Casson Leighton wrote:
> On Tuesday, August 11, 2020, Pičugins Arsenijs <crimier at yandex.ru> wrote:
> 
> 
> > Hi! I have an EOMA board + microdesktop PCB that's currently set up to be
> > power-able, and I can test things on a known-working board. Are you using
> > some kind of SD card image that I could download for testing, or just the
> > EOMA PCB + desktop card without any image-containing MicroSD card?
> 
> 
> he's got things built and documented it here:
> http://rhombus-tech.net/allwinner_a10/Building_Linux/
Yes, and here (Currently a work in progress):
http://rhombus-tech.net/allwinner/a20/EOMA68-A20_2-7-4_preproduction/

Pablo


From lkcl at lkcl.net  Tue Aug 11 12:47:51 2020
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Tue, 11 Aug 2020 12:47:51 +0100
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <20200811113445.ulco2jfcgmmr7ejl@pabbook>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<CAPweEDzVLBG7JSV7k_uHnsLWaeMz-Ce-m6p2BW3yw1-qB27ORg@mail.gmail.com>
	<20200811113445.ulco2jfcgmmr7ejl@pabbook>
Message-ID: <CAPweEDxM6z-onoKkWty5-RbUu_xAAv2K9GEwDpnEfjjP_AZ3WA@mail.gmail.com>

On Tue, Aug 11, 2020 at 12:35 PM Pablo Rath <pablo at parobalth.org> wrote:

> On Tue, Aug 11, 2020 at 11:37:41AM +0100, Luke Kenneth Casson Leighton wrote:

> Ok. I have tried that now. Pressed "2" while applying power over USB-OTG
> but an Allwinner USB FEL device is not found with 'sunxi-fel version'.
> Also tried to boot with my known working µSD-Card but there is no output
> on UART.

hm ok there is one more "trick" - actually uploading (and executing)
the spl bootloader followed by u-boot and everything else
https://linux-sunxi.org/FEL/USBBoot#Boot_the_system_over_USB

the old version, fel-boot, you had to first "run" then "execute".  the
newer version (sunxi-fel) looks like it does run-and-execute.

the first binary (the spl bootloader) fits into the 16k SRAM and until
that's executed (and it initialises the PLL and DDR3) there's flat-out
no chance of uploading anything at all into the upper areas of memory
(0x42000000) which are in the DDR3 RAM area.

i have in the past set up a linux kernel to convert the USB-OTG into a
usbserial "gadget", and also a usbnet-compatible g_ether "gadget".
the first way was successful in showing early console logs, and the
second was enough to get a USB eth0 that i could ssh in over.

l.


From pablo at parobalth.org  Tue Aug 11 21:50:52 2020
From: pablo at parobalth.org (Pablo Rath)
Date: Tue, 11 Aug 2020 22:50:52 +0200
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <CAPweEDxM6z-onoKkWty5-RbUu_xAAv2K9GEwDpnEfjjP_AZ3WA@mail.gmail.com>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<CAPweEDzVLBG7JSV7k_uHnsLWaeMz-Ce-m6p2BW3yw1-qB27ORg@mail.gmail.com>
	<20200811113445.ulco2jfcgmmr7ejl@pabbook>
	<CAPweEDxM6z-onoKkWty5-RbUu_xAAv2K9GEwDpnEfjjP_AZ3WA@mail.gmail.com>
Message-ID: <20200811205052.womrltjsmc2pl7lk@pabbook>

On Tue, Aug 11, 2020 at 12:47:51PM +0100, Luke Kenneth Casson Leighton wrote:
> On Tue, Aug 11, 2020 at 12:35 PM Pablo Rath <pablo at parobalth.org> wrote:
> 
> > On Tue, Aug 11, 2020 at 11:37:41AM +0100, Luke Kenneth Casson Leighton wrote:
> 
> > Ok. I have tried that now. Pressed "2" while applying power over USB-OTG
> > but an Allwinner USB FEL device is not found with 'sunxi-fel version'.
> > Also tried to boot with my known working µSD-Card but there is no output
> > on UART.
> 
> hm ok there is one more "trick" - actually uploading (and executing)
> the spl bootloader followed by u-boot and everything else
> https://linux-sunxi.org/FEL/USBBoot#Boot_the_system_over_USB
> 
> the old version, fel-boot, you had to first "run" then "execute".  the
> newer version (sunxi-fel) looks like it does run-and-execute.
> 
> the first binary (the spl bootloader) fits into the 16k SRAM and until
> that's executed (and it initialises the PLL and DDR3) there's flat-out
> no chance of uploading anything at all into the upper areas of memory
> (0x42000000) which are in the DDR3 RAM area.
> 
> i have in the past set up a linux kernel to convert the USB-OTG into a
> usbserial "gadget", and also a usbnet-compatible g_ether "gadget".
> the first way was successful in showing early console logs, and the
> second was enough to get a USB eth0 that i could ssh in over.

So just to make sure, your advice now is to work with the standalone
Computer Card and get usbserial or g_ether "gadget" working?
I have used (but not set up) g_ether "gadget" with ssh before and I have already
read about usbserial (seems well documented on linux-sunxi wiki) so I
think I will manage.

Pablo
> 
> l.
> 
> _______________________________________________
> arm-netbook mailing list arm-netbook at lists.phcomp.co.uk
> http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook
> Send large attachments to arm-netbook at files.phcomp.co.uk


From lkcl at lkcl.net  Tue Aug 11 22:03:31 2020
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Tue, 11 Aug 2020 22:03:31 +0100
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <20200811205052.womrltjsmc2pl7lk@pabbook>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<CAPweEDzVLBG7JSV7k_uHnsLWaeMz-Ce-m6p2BW3yw1-qB27ORg@mail.gmail.com>
	<20200811113445.ulco2jfcgmmr7ejl@pabbook>
	<CAPweEDxM6z-onoKkWty5-RbUu_xAAv2K9GEwDpnEfjjP_AZ3WA@mail.gmail.com>
	<20200811205052.womrltjsmc2pl7lk@pabbook>
Message-ID: <CAPweEDyxGQ4rrm1jJEHMhEBgqHu1tACXMA9=38NphsGAczEP+g@mail.gmail.com>

On Tue, Aug 11, 2020 at 9:51 PM Pablo Rath <pablo at parobalth.org> wrote:
>
> On Tue, Aug 11, 2020 at 12:47:51PM +0100, Luke Kenneth Casson Leighton wrote:
> > On Tue, Aug 11, 2020 at 12:35 PM Pablo Rath <pablo at parobalth.org> wrote:
> >
> > > On Tue, Aug 11, 2020 at 11:37:41AM +0100, Luke Kenneth Casson Leighton wrote:
> >
> > > Ok. I have tried that now. Pressed "2" while applying power over USB-OTG
> > > but an Allwinner USB FEL device is not found with 'sunxi-fel version'.
> > > Also tried to boot with my known working µSD-Card but there is no output
> > > on UART.
> >
> > hm ok there is one more "trick" - actually uploading (and executing)
> > the spl bootloader followed by u-boot and everything else
> > https://linux-sunxi.org/FEL/USBBoot#Boot_the_system_over_USB
> >
> > the old version, fel-boot, you had to first "run" then "execute".  the
> > newer version (sunxi-fel) looks like it does run-and-execute.
> >
> > the first binary (the spl bootloader) fits into the 16k SRAM and until
> > that's executed (and it initialises the PLL and DDR3) there's flat-out
> > no chance of uploading anything at all into the upper areas of memory
> > (0x42000000) which are in the DDR3 RAM area.
> >
> > i have in the past set up a linux kernel to convert the USB-OTG into a
> > usbserial "gadget", and also a usbnet-compatible g_ether "gadget".
> > the first way was successful in showing early console logs, and the
> > second was enough to get a USB eth0 that i could ssh in over.
>
> So just to make sure, your advice now is to work with the standalone
> Computer Card and get usbserial or g_ether "gadget" working?

to check that there's actually "something" working, yes.

> I have used (but not set up) g_ether "gadget" with ssh before and I have already
> read about usbserial (seems well documented on linux-sunxi wiki) so I
> think I will manage.

you need the "gadget" serial kernel config enabled, and usbserial as
well, they need to be built-in, you can't use them as "module options"
(.ko) if you want early boot messages.

l.


From pablo at parobalth.org  Thu Aug 13 08:05:27 2020
From: pablo at parobalth.org (Pablo Rath)
Date: Thu, 13 Aug 2020 09:05:27 +0200
Subject: [Arm-netbook] EOMA68-A20, MD 1.7 severe Power Problems
In-Reply-To: <996321597138461@mail.yandex.ru>
References: <20200726093000.nltv6wypuaztdesa@pabbook>
	<CAPweEDx+0ZpJZ7_ER0OA3Pcs4zzapcXi81bxhZruKKVgUCwrTw@mail.gmail.com>
	<20200726203108.66ndgur3imhsyhdu@pabbook>
	<CAPweEDxBeffn3CzWxG4XuJy7zDDjyPTbmFbQBneSXaozjD=DBg@mail.gmail.com>
	<20200811080714.rxvfx5eiqdopv2ei@pabbook>
	<20200811083102.eabgjasqe7whq7y5@pabbook>
	<996321597138461@mail.yandex.ru>
Message-ID: <20200813070527.2nd24xfohooetene@cherry>

>On Tue, Aug 11, 2020 at 12:36:00PM +0300, Pičugins Arsenijs wrote:
> Hi! I have an EOMA board + microdesktop PCB that's currently set up to be power-able, and I can test things on a known-working board. Are you using some kind of SD card image that I could download for testing, or just the EOMA PCB + desktop card without any image-containing MicroSD card?
> 
Hi Arsenijs,
I might have a small testing task for you. Would help me a lot. Do you have a working UART
connection (soldered pins to to the Micro Desktop) and 'sunxi-tools'
installed?

Pablo


From phil at hands.com  Tue Aug 25 22:03:12 2020
From: phil at hands.com (Philip Hands)
Date: Tue, 25 Aug 2020 23:03:12 +0200
Subject: [Arm-netbook] Free ASIC fab. for open designs
Message-ID: <874koqjv5b.fsf@hands.com>

Hi,

This seemed like it might be of intrest to someone here:

  https://fossi-foundation.org/2020/06/30/skywater-pdk

It seems that is a 130nm fab, based in the USA somewhere.

It came up in the "Debian Electronics BOF" session at DebConf20 (which
is going on this week, as an online event):

  https://debconf20.debconf.org/talks/86-debian-electronics-bof/

The video of that session should appear within a day or so.

Cheers, Phil.
-- 
|)|  Philip Hands  [+44 (0)20 8530 9560]  HANDS.COM Ltd.
|-|  http://www.hands.com/    http://ftp.uk.debian.org/
|(|  Hugo-Klemm-Strasse 34,   21075 Hamburg,    GERMANY


From lkcl at lkcl.net  Tue Aug 25 22:56:32 2020
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Tue, 25 Aug 2020 22:56:32 +0100
Subject: [Arm-netbook] Free ASIC fab. for open designs
In-Reply-To: <874koqjv5b.fsf@hands.com>
References: <874koqjv5b.fsf@hands.com>
Message-ID: <CAPweEDxsJ3gCeMXKm__22Sc8ZWFs8Hp9Z+J+cSTERUYQpLAmUw@mail.gmail.com>

On Tuesday, August 25, 2020, Philip Hands <phil at hands.com> wrote:

> Hi,
>
> This seemed like it might be of intrest to someone here:
>
>   https://fossi-foundation.org/2020/06/30/skywater-pdk
>
> It seems that is a 130nm fab, based in the USA somewhere.


yes.

it is around 25 sq mm and an 80 pin QFP fixed package.

LibreSOC is working with chip4makers and the tapeout deadline is at the end
of october.

l.




-- 
---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

From richard.wilbur at gmail.com  Wed Aug 26 03:54:59 2020
From: richard.wilbur at gmail.com (Richard Wilbur)
Date: Tue, 25 Aug 2020 19:54:59 -0700
Subject: [Arm-netbook] Free ASIC fab. for open designs
In-Reply-To: <CAPweEDxsJ3gCeMXKm__22Sc8ZWFs8Hp9Z+J+cSTERUYQpLAmUw@mail.gmail.com>
References: <CAPweEDxsJ3gCeMXKm__22Sc8ZWFs8Hp9Z+J+cSTERUYQpLAmUw@mail.gmail.com>
Message-ID: <432FABD6-F333-4F7B-983E-CEBFC084C8FF@gmail.com>

> On Aug 25, 2020, at 14:57, Luke Kenneth Casson Leighton <lkcl at lkcl.net> wrote:
> 
> On Tuesday, August 25, 2020, Philip Hands <phil at hands.com> wrote:
>> 
>> It seems that is a 130nm fab, based in the USA somewhere.
> 
> yes.
> 
> it is around 25 sq mm and an 80 pin QFP fixed package.

Very nice!  That sounds really cool from the perspective of someone who got a big kick out of VLSI Design class but never had the budget to run a personal design through to packaged dies.

80 pins and 25 sq mm at 0.13μm with free digital and analog cell designs.

Now, I wonder how quickly the free toolchain will solidify?



From lkcl at lkcl.net  Wed Aug 26 07:24:02 2020
From: lkcl at lkcl.net (Luke Kenneth Casson Leighton)
Date: Wed, 26 Aug 2020 07:24:02 +0100
Subject: [Arm-netbook] Free ASIC fab. for open designs
In-Reply-To: <432FABD6-F333-4F7B-983E-CEBFC084C8FF@gmail.com>
References: <CAPweEDxsJ3gCeMXKm__22Sc8ZWFs8Hp9Z+J+cSTERUYQpLAmUw@mail.gmail.com>
	<432FABD6-F333-4F7B-983E-CEBFC084C8FF@gmail.com>
Message-ID: <CAPweEDxftY9pVys5oEOQJkao9KD-7iDFJghU52Y1MSRdkc0n7g@mail.gmail.com>

---
crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

On Wed, Aug 26, 2020 at 3:55 AM Richard Wilbur <richard.wilbur at gmail.com> wrote:

> Very nice!  That sounds really cool from the perspective of someone who got a big kick out of VLSI Design class but never had the budget to run a personal design through to packaged dies.
>
> 80 pins and 25 sq mm at 0.13μm with free digital and analog cell designs.
>
> Now, I wonder how quickly the free toolchain will solidify?

* Efabless "Openlane" https://github.com/efabless/openlane

we are using alliance / coriolis2 because it is under programmatic
control (in python)

l.