Difference between revisions of "Anatomy of a Failover coreboot v2 Image"
| Line 5: | Line 5: | ||
'''XIP_ROM_BASE''' and '''XIP_ROM_SIZE''' are for MTRR setting during CAR to cache part of the ROM image. Speeds up anything with loops like copies and decompression. | '''XIP_ROM_BASE''' and '''XIP_ROM_SIZE''' are for MTRR setting during CAR to cache part of the ROM image. Speeds up anything with loops like copies and decompression. | ||
| + | |||
| + | |||
| + | == On the Timeline == | ||
| + | * Failover | ||
| + | |||
| + | * Chooses to use Normal or Fallback | ||
| + | This choose depends on a value which is stored in NVRAM aka CMOS. | ||
| + | This code is at the moment mainboard specific and can normally be found in cache_as_ram.c or auto.c. | ||
| + | |||
| + | * Runs Normal or Fallback | ||
| + | |||
== Some Errors you might come across and probable solutions == | == Some Errors you might come across and probable solutions == | ||
| Line 38: | Line 49: | ||
See also [[Section overlaps]] for a detailed description of a fix. | See also [[Section overlaps]] for a detailed description of a fix. | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
Revision as of 19:33, 24 June 2009
Contents |
Overview and according values
This is a pictorial view of FAILOVER_SIZE, _ROMBASE, ROM_IMAGE_SIZE, PAYLOAD_SIZE, ROM_SIZE, ROM_SECTION_SIZE, HAVE_FALLBACKBOOT, HAVE_FAILOVERBOOT for Options.lb and Config.lb.
XIP_ROM_BASE and XIP_ROM_SIZE are for MTRR setting during CAR to cache part of the ROM image. Speeds up anything with loops like copies and decompression.
On the Timeline
- Failover
- Chooses to use Normal or Fallback
This choose depends on a value which is stored in NVRAM aka CMOS. This code is at the moment mainboard specific and can normally be found in cache_as_ram.c or auto.c.
- Runs Normal or Fallback
Some Errors you might come across and probable solutions
coreboot input file larger than allowed size
Error:
./buildrom coreboot.strip coreboot.rom payload 0x70000 0x7f000 coreboot image is 458820 bytes; only 458752 allowed coreboot input file larger than allowed size!
Solution:
Typically caused by crt0 having a .data segment. Make sure all ROM data is defined as constant.
section .id overlaps section .rom
Error:
gcc -m32 -nostdlib -nostartfiles -static -o linuxbios -T ldscript.ld crt0.o /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../x86_64-suse-linux/bin/ld: section .id [00000000ffffefd2 -> 00000000ffffefef] overlaps section .rom [00000000fffeed83 -> 00000000ffffff5f] /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../x86_64-suse-linux/bin/ld: linuxbios: section .id lma 0xffffefd2 overlaps previous sections /usr/lib64/gcc/x86_64-suse-linux/4.3/../../../../x86_64-suse-linux/bin/ld: linuxbios: section .reset lma 0xffffeff0 overlaps previous sections collect2: ld returned 1 exit status make[1]: *** [linuxbios] Error 1 make[1]: Leaving directory `/srv/svn/linuxbios-extra/tmp/LinuxBIOSv2-3021/util/abuild/linuxbios-builds/amd_serengeti_cheetah_fam10/fallback' make: *** [fallback/linuxbios.rom] Error 1
Solution:
Increase the ROM_IMAGE_SIZE of the failing piece. In this case the fallback image.
See also Section overlaps for a detailed description of a fix.
