[coreboot] Regarding offset adjustment for building coreboot.

Jay Talbott JayTalbott at sysproconsulting.com
Fri Apr 8 17:32:09 CEST 2016

The FSP is rebased with the Intel BCT tool, not the FITC tool. 

> On Apr 8, 2016, at 7:38 AM, Martin Roth <gaumless at gmail.com> wrote:
> Not knowing which platform this is makes it a little harder to
> determine what's locked in place.  We'd also need to know if this is
> getting built from the top of the coreboot.org tree, an old
> coreboot.org commit or an private repo with many changes from
> coreboot.org.
> Microcode should be able to be placed in any area for most of the FSP
> platforms, but it might need to be changed in Kconfig or the Makefile
> so that the system knows where it is.  You might also want to look at
> just including the necessary microcode patches for your particular
> board if possible.  Many of the FSP platforms include all available
> microcode back to some pre-production parts by default.
> The mrc cache can be moved at build time, but needs to be on the
> correct boundary, and CANNOT have anything else in the same sector on
> the flash.  The cache gets erased, so moving it to an odd boundary or
> putting other things in the same sector will cause interesting issues.
> The FSP itself can also be moved, but it needs to be rebased with
> intel's FITC tool, and coreboot needs to know the location at build
> time.
> Finally, you might want to look at leaving out the small or
> non-essential files, and add them after the build completes to make
> sure that there is contiguous space for your essential components:
> bootsplash.img, config, fspd.bin and cmos_layout.bin
> Martin
> On Fri, Apr 8, 2016 at 4:29 AM, Patrick Georgi via coreboot
> <coreboot at coreboot.org> wrote:
>> 2016-04-08 11:17 GMT+02:00 Nico Huber <nico.huber at secunet.com>:
>>> you also stripped:
>>> fallback/payload               0x1b140    payload      769955
>>> I guess he means that a fresh build with a bigger (865KiB instead of
>>> 752KiB) payload fails.
>> Of course you're right. I misunderstood the original issue.
>> It's hard to tell how locked down various files are. There's at least
>> some alignment going on for  cpu_microcode_blob.bin, mrc.cache,
>> uefi_nvs.bin and fsp.bin, but there may be more to it.
>> Tweaking -position and -align values for mrc.cache and uefi_nvs.bin
>> should provide enough space for a larger payload.
>> Given that uefi_nvs.bin is not mentioned in current master, I have no
>> idea how that came to be.
>> Patrick
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