[coreboot] [PATCH]cbfs locate function

Stefan Reinauer stepan at coresystems.de
Mon Nov 9 18:00:20 CET 2009

Patrick Georgi wrote:
> Hi,
> attached patch adds a "locate" function cbfstool, which helps you find
> out a suitable address to put a XIP stage to.
> Specifically, you pass it the file (to get its filesize), its filename
> (as the header has a variable length that depends on it), and the
> granularity requirement it has to fit in (for XIP).
> The granularity is MTRR-style: when you request 0x10000, cbfstool looks
> for a suitable place in a 64kb-aligned 64kb block.
> cbfstool simply prints out a hex value which is the start address of a
> suitably located free memory block. That value can then be used with
> cbfs add-stage to store the file in the ROM image.
> I need this function for my "newfailover" project, which will push most
> of the current bootblock code into CBFS (everything but enable_rom).
> It's a two-step operation (instead of being merged into cbfs add-stage)
> because the image must be linked twice: First, with some bogus, but safe
> base address (eg. 0) to figure out the target address (based on file
> size). Then a second time at the target address.
> The approximative code flow is: link file, cbfstool locate, link file
> again, cbfstool add-stage.
> I'm not quite sure about the failure modes yet, so all it does for now
> is returning an address of "0" if no suitable place could be found.
> Maybe returning "1" is a better idea, as "0" is the value used when
> cbfstool add-stage can freely choose the location. "1" should already
> lead to an error.
> Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>
We need a new and working failover..

Acked-by: Stefan Reinauer <stepan at coresystems.de>

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