Difference between revisions of "Anatomy of a Failover coreboot v2 Image"
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| + | == Note == | ||
| + | |||
| + | <div id="foo" style="margin-top:0.5em; padding:0.5em 0.5em 0.5em 0.5em; background-color:#ff6666; align:right; border:1px solid #ff3333;"> | ||
| + | |||
| + | === This page is obsolete === | ||
| + | |||
| + | '''Note''': The information on this page is no longer correct. Instead coreboot uses [[CBFS]] now. | ||
| + | </div> | ||
| + | |||
| + | == 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'''. | 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'''. | ||
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'''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 == | ||
| + | |||
| + | The '''failover''' image... | ||
| + | |||
| + | * chooses to use '''normal''' or '''fallback'''. | ||
| + | ** This choice depends on a value which is stored in NVRAM a.k.a 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 == | ||
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Increase the '''ROM_IMAGE_SIZE''' of the failing piece. In this case the '''fallback''' image. | Increase the '''ROM_IMAGE_SIZE''' of the failing piece. In this case the '''fallback''' image. | ||
| − | See also [[ | + | See also [[FAQ/Obsolete#How_do_I_fix_the_.22section_overlaps.22_error_in_v2.3F|the FAQ]] for a detailed description of a fix. |
Latest revision as of 14:32, 26 September 2010
Contents |
[edit] Note
[edit] This page is obsolete
Note: The information on this page is no longer correct. Instead coreboot uses CBFS now.
[edit] 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.
[edit] On the timeline
The failover image...
- chooses to use normal or fallback.
- This choice depends on a value which is stored in NVRAM a.k.a 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.
[edit] Some Errors you might come across and probable solutions
[edit] 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.
[edit] 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 the FAQ for a detailed description of a fix.
