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kernel: mtdsplit: add support for H3C VFS filesystem

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The bootloader on some H3C devices (for example HPE 1920 switches) only
supports booting from flash by reading an image from an "VFS" filesystem
which spans most of the available flash. The filesystem size is hard-
coded in the bootloader. However, as long as no write operations are
performed in the bootloader menu, it is sufficient if the start of the
partition contains a valid filesystem with the kernel image.

This mtdsplit parser reads the size and location of the kernel image and
finds the location of the rootfs stored after it. It assumes that the
filesystem image matches the layout of one generated by mkh3cvfs, with
a filename of "openwrt-kernel.bin" for the kernel image.

Signed-off-by: Jan Hoffmann <jan@3e8.eu>
This commit is contained in:
Jan Hoffmann
2022-07-23 22:53:17 +02:00
committed by Daniel Golle
parent 81e3017609
commit 3b1261224a
5 changed files with 178 additions and 0 deletions
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target/linux/generic/config-5.10
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@@ -3683,6 +3683,7 @@ CONFIG_MTD_SPLIT=y
# CONFIG_MTD_SPLIT_FIRMWARE is not set
CONFIG_MTD_SPLIT_FIRMWARE_NAME="firmware"
# CONFIG_MTD_SPLIT_FIT_FW is not set
# CONFIG_MTD_SPLIT_H3C_VFS is not set
# CONFIG_MTD_SPLIT_JIMAGE_FW is not set
# CONFIG_MTD_SPLIT_LZMA_FW is not set
# CONFIG_MTD_SPLIT_MINOR_FW is not set