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authorAndrew Robbins <contact@andrewrobbins.info>2018-12-25 21:41:27 -0500
committerAndrew Robbins <contact@andrewrobbins.info>2018-12-25 21:41:27 -0500
commitc9e5a6b91406fe0e1b8188c2818c5e2f7ad3e267 (patch)
treeed2e90f3927d0b3094121c42b338e38463057281 /projects/coreboot/configs/kcma-d8/arch
parent4f989bf93a6b8c1a6ce0f38adf47469cd58493e0 (diff)
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Automate updating SeaGRUB floppy image blocklists
Related issue #553 Determining the byte offset of core.img on the SeaGRUB floppy is accomplished using grub_bo(), though it is memory bound as it requires reading hex dumps for the pattern and comparand into memory. The blocklists that are stored in the boot record and core.img are sector numbers. Of particular note is the blocklist written to core.img is always the location of its *second* sector--not the first. Blocklists are used because floppy disks DO NOT have an MBR or MBR gap as the filesystem spans the entire disk. Consequently, the core.img cannot be stored in the usual ~1MiB gap. Unfortunately, using blocklists means they will have to be updated whenever core.img is moved. New functions added to grub-helper: * grub_bo * grub_bo_dump * grub_bo_search * grub_blocklist_format * grub_blocklist_generate * grub_floppy_image_make_bootable * grub_floppy_image_update_blocklists
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