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45 lines
1.5 KiB
Bash
45 lines
1.5 KiB
Bash
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# Copyright (C) 2018 OpenWrt.org
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#
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. /lib/functions.sh
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# The mtd partition 'ubi' and 'rootfs_1' on NAND flash are os-image
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# partitions. These partitions are called as "Bank1/Bank2" in U-Boot
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# on WXR-2533DHP, and they are checked conditions when booting.
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# Then, U-Boot checks kernel and rootfs volumes in ubi, but U-Boot
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# needs "ubi_rootfs" as rootfs volume name. And, U-Boot checks the
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# checksum at the end of rootfs (ubi_rootfs).
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# When U-Boot writes os-image into the Bank, only kernel, rootfs
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# (ubi_rootfs) and rootfs_data (ubi_rootfs_data) volumes are wrote
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# into the Bank. (not full ubi image)
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#
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# == U-Boot Behaviors ==
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# - Bank1/Bank2 images are good, images are different
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# -> writes os-image to Bank1 from Bank2
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# (this behavior is used to firmware upgrade in stock firmware)
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# - Bank1 image is broken (or checksum error)
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# -> writes os-image to Bank1 from Bank2
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# - Bank2 image is broken (or checksum error)
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# -> writes os-image to Bank2 from Bank1
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# - Bank1/Bank2 images are broken (or checksum error)
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# -> start tftp
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buffalo_upgrade_prepare_ubi() {
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local ubidev="$( nand_find_ubi ubi )"
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local mtdnum2="$( find_mtd_index rootfs_1 )"
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if [ ! "$mtdnum2" ]; then
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echo "cannot find second ubi mtd partition rootfs_1"
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return 1
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fi
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local ubidev2="$( nand_find_ubi rootfs_1 )"
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if [ ! "$ubidev2" ] && [ -n "$mtdnum2" ]; then
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ubiattach -m "$mtdnum2"
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ubidev2="$( nand_find_ubi rootfs_1 )"
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fi
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ubirmvol /dev/$ubidev -N ubi_rootfs_data &> /dev/null || true
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ubirmvol /dev/$ubidev2 -N kernel &> /dev/null || true
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}
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