[Arm-netbook] next step is a boot image

[Luke Kenneth Casson Leighton]

On Monday, January 16, 2023, Andreas Grapentin <andreas at grapentin.org>
wrote:
>
>
>> On 16. Jan 2023, at 20:01, Luke Kenneth Casson Leighton <lkcl at lkcl.net>
wrote:
>>
>> On Mon, Jan 16, 2023 at 6:56 PM Andreas Grapentin <andreas at grapentin.org>
wrote:
>>
>>> In the process of attaching peripheries, I must have blown something on
the microdesktop, the power LED no longer lights up, tested multiple
chargers. I’m fairly certain that the LED did light up green when I started
working on the board today. Is it possible that I blew a fuse somewhere?
>>
>> yes it should. no there's no fuse.  you'll need a multimeter, be
*careful*.
>> i suggest taking the Card out.  if it's really borked you can power it
>> with a 5V USB "charger" cable (into the 2 standard USB sockets).
>>
>> also, check you inserted the Card correctly: not one row along or one
>> pin along, and make sure no contact between the two PCBs.
>
> forgot to mention, I’m using the expansion header on the micro desktop
for the UART connection.

yep ido that.

> Power to the EOMA card directly through the microUSB works, that’s what
I’m doing right now.

the SY6280 is *only* powered by the 5v MD Power rail.
you *cannot* power the MD through the USB-OTG and if it
was possible it would damage everything as the power
drain would be exceeded.

the 5v rail connects to 3.3v which then powers the
Level Shifter and the microsd socket.

you abolutely cannot expect the VREF of the Card to
power the microsd socket.


it is imperative that you provide independent 5v power.

> I haven’t tried the USB sockets on the micro desktop though, that might
be worth a shot.

if 12v is not working it will be your only option.

>> it's possible to reconfigure u-boot (etc) to have the OS on the Card's
micro-sd.
>
> I believe I’m using a quite old u-boot boot script.

that is irrelevant.  u-boot-spl.bin is what needs compiling
and that is done with compile options.  "make config".

i think.

you need to establish which phase has been achieved.
there are MULTIPLE phases.
EVERY ONE OF THEM needs properly configuring.

l.


-- 
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