[coreboot] [PATCH]Remove failover/fallback/normal decision from mainboards' romstage.c

Stefan Reinauer stepan at coresystems.de
Wed Mar 17 23:19:31 CET 2010

On 3/17/10 10:42 PM, Patrick Georgi wrote:
> Hi,
> attached patch removes the failover/fallback/normal decision from
> romstage.c files of mainboards that did failover. It is the first part
> of a larger effort.
> This mechanism was used by newconfig style builds and is not useful
> anymore since we dropped newconfig. In fact, in rare circumstances it
> might lead to coreboot hanging early on boot (when normal is selected -
> this should fix itself by three reboots, as coreboot reverts to fallback
> then)
> The code assumes that various places are visited twice on boot. That's
> not true anymore for Kconfig builds, no matter if the boards is using
> romstage as bootblock, or the tiny bootblock.
> Removing these assumptions simplifies the code and should help the user
> when trying to track the code flow.
> The change looks big, but it's really a couple of simple and relatively
> mechanical steps repeated for lots of boards:
> 1. In failover_process(), I removed the fallback/normal selection logic
> and kept the remaining hardware init in. The if-clauses' conditions are
> reverted to match.
> Remove #if failover||fallback guard.
> 2. Change cache_as_ram_main() to first call failover_process, then
> real_main unconditionally.
> 3. Move failover_process's code to the beginning of real_main, remove
> failover_process and its call in cache_as_ram_main.
> 4. Remove cache_as_ram_main, rename real_main to cache_as_ram_main (same
> arguments, so no problem with that)
> As those changes are quite mechanical, but not easily automated, I'd
> prefer some additional eyeballs that look if the end result of the
> boards looks alike (they should be more similar to each other than before).
> The patch is build tested and boot tested on amd/serengeti_cheetah in
> SimNow.
> After the changes, the entire hardware init is ran on cold boot, on warm
> reset the hardware init that used to be in failover_process is skipped.
> The affected boards do not use __fallback_image or __normal_image anymore.
> The next step will a comparable change to the remaining boards.
> After that, I'll aim for the removal of the remaining uses of
> HAVE_FAILOVER_BOOT, USE_FAILOVER_IMAGE and their definition in Kconfig.
> Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>
Acked-by: Stefan Reinauer <stepan at coresystems.de>

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