[coreboot] Long boot delay with a large CBFS

Werner Zeh werner.zeh at gmx.net
Mon Nov 16 20:04:51 CET 2015

Hi Ben.

I currently use a Bay Trail design with 16 MB SPI flash
of which 14 MB are used for CBFS. I Never have seen such effects on my 

Do you use the latest coreboot tree (master)?


Am 16.11.2015 um 19:32 schrieb Ben Gardner:
> [The previous email got chopped. This is a re-send.]
> Hi all,
> I have a 16 MB BIOS flash on a fsp_baytrail based design.
> I tried expanding the CBFS to fill the whole space, but found that to
> cause a 10-15 sec boot delay.
> The offending code appears to be in cbfs_locate() in lib/cbfs.c:
> if (memcmp(file.magic, CBFS_FILE_MAGIC, sizeof(file.magic))) {
>    offset++;
>    offset = ALIGN_UP(offset, CBFS_ALIGNMENT);
>    continue;
> }
> In SeaBIOS, the equivalent code does a break instead of a continue.
> I'n not terribly familiar with the design goals of the CBFS.
> What is the purpose behind continuing if a bad entry is encountered?
> It appears that a 'bad' entry only occurs at the end of the CBFS.
> Thanks,
> Ben

More information about the coreboot mailing list