[U-Boot] u-boot-x86 sf probe fail

[Simon Glass]

Hi Hilbert,

On 2 June 2016 at 19:40, Bin Meng <bmeng.cn at gmail.com> wrote:
> Hi Hilbert,
>
> On Thu, Jun 2, 2016 at 11:46 AM, Hilbert Tu(杜睿哲_Pegatron)
> <Hilbert_Tu at pegatroncorp.com> wrote:
>> Hi Bin,
>>
>> Sorry for the late.
>>
>> I have checked with Intel's support and following is their response:
>>
>>>>On the other hand, for the question about ICH7 or ICH9. Unfortunately, the Bios Writers Guides (BWGs) or the EDS is unstated any information about ICH9. But, reviewing in section 22.4.1 on page 498 of the EDS specifies that the non-descriptor mode is the same as ICH7 mode. However, the non-descriptor mode is not supported and a valid Flash Descriptor is required for this SoC.
>>
>> So I think the current u-boot cannot support SPI access under Atom C2000 with Intel FSP. I am still working on how to read the related registers in u-boot since I am not sure the default SPI base address (0x00001fff) is correct or not. If you know that, please advise. Thanks.
>
> I am confused, You said you were booting U-Boot from coreboot, so
> U-Boot itself does not use Intel FSP. But here you mentioned Intel
> FSP?
>
> The SPI base address 0x1ffff does not look correct. That's probably
> the failure of SPI flash probe.

You started another thread, but can we continue the discussion here?

It sounds like you are using coreboot with an FSP. So U-Boot should be
able to access SPI flash. I suggest you dig into the SPI driver in
coreboot, and see if the SPI base address is the same. I agree with
Bin that 1ffff sounds wrong. See the call to pch_get_spi_base() in the
U-Boot SPI driver.

Regards,
Simon