Difference between revisions of "Fallback mechanism"
Revision as of 11:56, 21 February 2013
The fallback mecanism permits to have 2 different romstage,ramstage,payload in the same images under a different prefix. The switch between both can be governed by an nvram configuration parameter.
- build the coreboot image as usual, it will produce an image in build/coreboot.rom
- After the first build run:
- Optionally change the payload.
- Go in
General setup --->
(fallback) CBFS prefix to use
(normal) CBFS prefix to use
- Go back to the main menu and select:
Architecture (x86) --->
select the following option:
[*] Update existing coreboot.rom image
Exit and save and rebuild...
The image will then have fallback and normal:
Name Offset Type Size cmos_layout.bin 0x0 cmos_layout 1776 pci1002,9710.rom 0x740 optionrom 60928 fallback/romstage 0xf580 stage 92823 fallback/coreboot_ram 0x26080 stage 66639 fallback/payload 0x36540 payload 54976 config 0x43c40 raw 4455 normal/romstage 0x44e00 stage 92823 normal/coreboot_ram 0x5b8c0 stage 68820 normal/payload 0x6c600 payload 159949 (empty) 0x93700 null 442136