[U-Boot] [PATCH 25/25] x86: Add a README.x86 for U-Boot on x86 support

[Bin Meng]

Hi Pavel,

On Tue, Dec 16, 2014 at 6:34 AM, Pavel Machek <pavel at denx.de> wrote:
> Hi!
>
>> +Status
>> +------
>> +U-Boot supports running as a coreboot [1] payload on x86. So far only link
>> +(Chromebook pixel) has been tested, but it should work with minimal
>> adjustments
>
> Link is codeword for Chromebook Pixel? I'd write "Chromebook Pixel
> (Link)" if so.
>
>> +on other x86 boards since coreboot deals with most of the low-level details.
>> +
>> +U-Boot also supports booting directly from x86 reset vector without coreboot,
>> +aka raw support or bare support. Currently Google Chromebook link and Intel
>
> Should this me "Chromebook Pixel"?
>
>
>> +Building rom version U-Boot (hereafter referred to as u-boot.rom) is a little
>
> "ROM version of" ?
>
>> +bit tricky, as generally it requires several binary blobs which are not shipped
>> +in the U-Boot source tree. Due to this reason, the u-boot.rom build is not
>> +turned on by default in the U-Boot source tree. Firstly, you need turn it on
>> +by uncommenting the following line in the main U-Boot Makefile:
>> +
>> +# ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
>> +
>> +Google Chromebook link specific instructions:
>
> "link -> Pixel"?
>
>> +Firstly, you need the following binary blobs:
>
> Firstly->First
>
>> +You can get these binary blobs by:
>> +
>> +$ git clone http://review.coreboot.org/p/blobs.git
>> +$ cd blobs
>> +
>> +Find the following files:
>> +
>> +* ./mainboard/google/link/descriptor.bin
>> +* ./mainboard/google/link/me.bin
>> +* ./northbridge/intel/sandybridge/systemagent-ivybridge.bin
>> +
>> +The 3rd one should be renamed to mrc.bin.
>
> Should there be instruction where to put those files? Perhaps a script
> doing this and getting ROM would be nice?
>
>> +As for the video ROM, you can get it here [2].
>> +
>> +Now you can build U-Boot and obtain u-boot.rom:
>
>> +$ make chromebook_link_defconfig
>> +$ make all
>> +
>> +Intel Crown Bay specific instructions:
>> +
>> +U-Boot support of Intel Crown Bay board [3] relies on a binary blob called
>> +Firmware Support Package [4] to perform all the necessary initialization steps
>> +as documented in the BIOS Writer Guide including initialization of
>> the CPU,
>
> "Guide, "
>
>
>> +Downalod the Intel FSP for Atom E6xx series and Platform Controller
>
> -> Download.
>

Most issues fixed in the v4 patch @
http://patchwork.ozlabs.org/patch/422203/, except the Chromebook Pixel
(link) issue which will need Simon to comment.

Regards,
Bin