[flashrom] AMD - SP5100 - take SPI ownership (1/2)

Wei Hu wei at aristanetworks.com
Fri Apr 26 23:11:30 CEST 2013

I'm running AMI BIOS and I have disabled USB 3.0 in BIOS setup. The
controller doesn't show up in lspci. I do have a USB keyboard and a
USB mouse plugged in.

On Fri, Apr 26, 2013 at 1:44 PM, Martin Roth <martin.roth at se-eng.com> wrote:
> Hi Wei,
>   It's probably the xHCI controller code running.  I'm not sure when it's
> actually
> active though - If you have any USB3 devices plugged into the system, you
> might want
> to remove those and try flashing again.  It *MIGHT* be that simple, but
> we're probably
> not that lucky.  If that *DOES* work, please let us know - I'd be very
> interested in
> knowing that.
> I didn't see what BIOS rom you were trying to flash - If it's an IBV BIOS,
> you could try
> rebooting and disabling USB3 in the setup engine.  I'd expect that that
> would take care
> of the problem.  Then we just need to figure out a way to disable this
> without disrupting
> the system at runtime...
> Hope this helps.
> Martin
> On 04/26/2013 01:04 PM, Wei Hu wrote:
>> Hi Rudolf,
>> I wanted to follow up with an issue on my AMD chipset. Here is my
>> original question:
>> http://www.flashrom.org/pipermail/flashrom/2013-April/010924.html.
>> Basically the IMC bit in the LPC PCI config register at offset 0x40 is
>> not set, but flashrom still finds something else is accessing the
>> flash chip and decides to bail out.
>> I was led to your patch so I gave it a try. I removed the IMC bit
>> check in your patch but still the IMC seems to be indeed inactive,
>> since mbox_port read 0. Also I noticed you wrote 0x5a to enter conf
>> mode and 0xa5 to exit conf mode. According to the datasheet 0x55 and
>> 0xaa should be written instead. I made that change but it didn't help
>> either.
>> Can someone think of any other possible things that's accessing the chip?
>> Thanks,
>> Wei
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