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Diffstat (limited to 'Documentation/security/vboot/index.md')
| -rw-r--r-- | Documentation/security/vboot/index.md | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/security/vboot/index.md b/Documentation/security/vboot/index.md index 97420893e5..400c2b5149 100644 --- a/Documentation/security/vboot/index.md +++ b/Documentation/security/vboot/index.md @@ -186,6 +186,26 @@ In addition to adding the coreboot files into the read-only region, enabling vboot causes the build script to add the read/write files into coreboot file systems in *FW_MAIN_A* and *FW_MAIN_B*. +**RO_REGION_ONLY** + +The files added to this list will only be placed in the read-only region and +not into the read/write coreboot file systems in *FW_MAIN_A* and *FW_MAIN_B*. + +**VBOOT_ENABLE_CBFS_FALLBACK** + +Normally coreboot will use the active read/write coreboot file system for all +of it's file access when VBOOT is active and is not in recovery mode. + +When the `VBOOT_ENABLE_CBFS_FALLBACK` option is enabled the cbfs file system will +first try to locate a file in the active read/write file system. If the file +doesn't exist here the file system will try to locate the file in the read-only +file system. + +This option can be used to prevent duplication of static data. Files can be +removed from the read/write partitions by adding them to the `RO_REGION_ONLY` +config. If a file needs to be changed in a later stage simply remove it from +this list. + *** ## Signing the coreboot Image |