[coreboot] [PATCH]clean up bootblocksize handling in cbfstool, kconfig

Maciej Pijanka maciej.pijanka at gmail.com
Thu Nov 12 00:57:18 CET 2009

On 12/11/2009, Myles Watson <mylesgw at gmail.com> wrote:
>>> This doesn't seem like it should be a config option any more.
>> Ideally, it will become some automatic "as small as possible"
>> configuration.
>> Unfortunately ld doesn't allow to align everything to an upper boundary,
>> so
>> this requires the link-twice trick or so.
>> So for now, I'd like to keep it there - people might want to tweak it. As
>> an
>> example (which made me look into this in the first place), someone
>> (agaran)
>> on #coreboot wanted to use a smaller bootblock. Until this automatically
>> happens, we'll have to allow this to change.
> Sounds good.

For me, ROMBASE must be at 0xFFFE000, that is 4G - romchip size (128k).
if i try to set it to anything else i get some errors while build like:

$ grep ROMBASE build/ldoptions ; grep -A2 ROMBASE
CONFIG_ROMBASE = 0xfffe1000;
config ROMBASE
        default 0xfffe1000
    GEN        build.h
    CC         lib/version.o
    AR         coreboot.a
    CC         coreboot_ram.o
    CC         coreboot_ram
    PAYLOAD    payload.elf l
    CBFSPRINT  coreboot.rom

/home/agaran/Coreboot/trunk/build/coreboot.rom: 128 kB, bootblocksize
0, romsize 131072, offset 0x0
Alignment: 64 bytes

Name                           Offset     Type         Size
fallback/coreboot_ram          0x0        stage        33186
fallback/payload               0x8200     payload      16172
                               0xc180     null         81464
make: *** [/home/agaran/Coreboot/trunk/build/coreboot.rom] Segmentation fault
make: *** Deleting file `/home/agaran/Coreboot/trunk/build/coreboot.rom'

but i found way that works for me (but it is somewhat ugly)
(see patch in attachment)

this causes to increase space before actual rom code, but main
disadvantage is need to make this change manual, probably this could
be scripted (default extra gap = 0, and changed via some echo after
first linking when amount of space after rom code before jumpvector is

or maybe you have better idea

ps. please just tell me if this make no sense at all

best regards

Maciej Pijanka, PLD-Linux Developer, Reg Linux user #133161
POE/Perl user
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