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kernel: mtdsplit: add support for brnImages

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This adds brnImage (used with the brnboot bootloader) firmware parsing
support. brnboot verifies the integrity of the firmware stored on the
"Code Image" partitions by looking at the 12 byte footer at the very end
of the partition. This footer contains the checksum of the original
brnImage (kernel + rootfs/squashfs) and must not be touched (by our JFFS2
rootfs_data - otherwise the image will not be bootable anymore).

Big thanks to Mathias Kresin for analyzing the brnImage structure and
finding out the information how to keep images valid even when adding a
nested rootfs_data partition.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>

SVN-Revision: 48261
This commit is contained in:
Felix Fietkau
2016-01-17 10:40:51 +00:00
parent 3348279eca
commit bdd2772f1d
7 changed files with 114 additions and 0 deletions
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target/linux/generic/config-4.4
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@@ -2318,6 +2318,7 @@ CONFIG_MTD_ROOTFS_ROOT_DEV=y
# CONFIG_MTD_SPI_NOR is not set
# CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is not set
CONFIG_MTD_SPLIT=y
# CONFIG_MTD_SPLIT_BRNIMAGE_FW is not set
# CONFIG_MTD_SPLIT_FIRMWARE is not set
CONFIG_MTD_SPLIT_FIRMWARE_NAME="firmware"
# CONFIG_MTD_SPLIT_FIT_FW is not set