[Arm-netbook] [EOMA68-A20] SATA testing

[luke.leighton]

On Thu, Sep 5, 2013 at 8:37 AM, luke.leighton <luke.leighton at gmail.com> wrote:
> On Thu, Sep 5, 2013 at 1:16 AM, Christopher Thomas
> <christopher at firemothindustries.com> wrote:
>>
>>> > i meant "are they the right length" - the answer's that the TX lines
>>> > are 7ps out but the spec says that up to 30ps is ok.
>>> >
>>> >> in each track and connect both resistors with scope probes to further
>>> >> balance it.
>>> >> (A bit excessive me thinks for the kind of results you can extract from
>>> >> it.)
>>> >
>>> > well... i'm thinking perhaps the capacitors should be replaced with
>>> > 0R resistors temporarily (so that no board-level revisions are needed)
>>> > and then the capacitors put onto the external I/O board, as near as
>>> > possible to the SATA connector.
>>>
>>>
>>> I have done exactly that, with no results.
>>
>>
>> Forgot to include the image.
>> http://i.imgur.com/az9RYui.jpg
>
>  this is really weird.

ok, next thing i decided to short out D1 _and_ R2, then power off of
both a 5.0V USB _and_ the USB-OTG just in case it was a power issue.

also i got some 103 capacitors from maplins (big thank you to brad of
maplin's portsmouth, you were really helpful!) and did what chris did.

then i simply took the SATA drive out and plugged it back in, out in,
out in, didn't shake it all about - and i got a ton of errors on the
console.

this is progress!

<6>ata1: hard resetting link
[  843.734990] ata1: hard resetting link
<6>ata1: SATA link down (SStatus 1 SControl 310)
[  846.008039] ata1: SATA link down (SStatus 1 SControl 310)
<3>ata1: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe frozen t1
[  846.021387] ata1: exception Emask 0x10 SAct 0x0 SErr 0x4040000 action 0xe fro
zen t1
<3>ata1: irq_stat 0x00000040, connection status changed
[  846.035004] ata1: irq_stat 0x00000040, connection status changed
<3>ata1: SError: { CommWake DevExch }
[  846.045248] ata1: SError: { CommWake DevExch }
<4>ata1: limiting SATA link speed to 1.5 Gbps
[  846.054612] ata1: limiting SATA link speed to 1.5 Gbps
<6>ata1: hard resetting link
[  846.063359] ata1: hard resetting link

so i think i might have shorted something, i'll have to check, but
that's better than it was.

l.