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@coreboot.org wrote:
2016-04-08 11:17 GMT+02:00 Nico Huber nico.huber@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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Martin Roth