diff options
Diffstat (limited to 'src/lib/cbfs.c')
| -rw-r--r-- | src/lib/cbfs.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c index 9ac1bc084b..13b5afb6ea 100644 --- a/src/lib/cbfs.c +++ b/src/lib/cbfs.c @@ -62,6 +62,22 @@ int cbfs_boot_locate(struct cbfsf *fh, const char *name, uint32_t *type) } int ret = cbfs_locate(fh, &rdev, name, type); + + if (CONFIG(VBOOT_ENABLE_CBFS_FALLBACK) && ret) { + + /* + * When VBOOT_ENABLE_CBFS_FALLBACK is enabled and a file is not available in the + * active RW region, the RO (COREBOOT) region will be used to locate the file. + * + * This functionality makes it possible to avoid duplicate files in the RO + * and RW partitions while maintaining updateability. + * + * Files can be added to the RO_REGION_ONLY config option to use this feature. + */ + printk(BIOS_DEBUG, "Fall back to RO region for %s\n", name); + ret = cbfs_locate_file_in_region(fh, "COREBOOT", name, type); + } + if (!ret) if (vboot_measure_cbfs_hook(fh, name)) return -1; |