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ramips: support dual image feature on ALFA Network boards
New U-Boot version for MediaTek MT76x8/MT762x based ALFA Network boards includes support for a 'dual image' feature. Users can enable it using U-Boot environment variable 'dual_image' ('1' -> enabled). When 'dual image' feature is enabled, U-Boot will modify DTB and divide the original 'firmware' flash area into two, equal in size and aligned to 64 KB partitions: 'firmware' and 'backup'. U-Boot will also adjust size of 'firmware' area to match installed flash chip size. U-Boot will load kernel from active partition which is marked with env variable 'bootactive' ('1' -> first partition, '2' -> second partition) and rename both partitions accordingly ('firmware' <-> 'backup'). There are 3 additional env variables used to control 'dual image' mode: - bootlimit - maximum number of unsuccessful boot tries (default: '3') - bootcount - current number of boot tries - bootchanged - flag which informs that active partition was changed; if it is set and 'bootcount' reaches 'bootlimit' value, U-Boot will start web-based recovery which then updates both partitions with provided image Signed-off-by: Piotr Dymacz <pepe2k@gmail.com> (backported from commit bc173ddd8381b03dde8cc2e6c66d0cd392c62bbd)
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@ -5,8 +5,15 @@ START=99
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start() {
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. /lib/functions.sh
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local board=$(board_name)
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if [ $board = "sk-wb8" ]; then
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case $(board_name) in
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alfa-network,ac1200rm|\
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alfa-network,awusfree1|\
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alfa-network,tube-e4g)
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[ -n "$(fw_printenv bootcount bootchanged 2>/dev/null)" ] &&\
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echo -e "bootcount\nbootchanged\n" | /usr/sbin/fw_setenv -s -
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;;
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sk-wb8)
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fw_setenv bootcount 0
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fi
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;;
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esac
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}
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@ -5,6 +5,9 @@
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PART_NAME=firmware
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REQUIRE_IMAGE_METADATA=1
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RAMFS_COPY_BIN='fw_printenv fw_setenv'
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RAMFS_COPY_DATA='/etc/fw_env.config /var/lock/fw_printenv.lock'
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platform_check_image() {
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return 0
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}
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@ -36,6 +39,20 @@ platform_do_upgrade() {
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local board=$(board_name)
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case "$board" in
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alfa-network,ac1200rm|\
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alfa-network,awusfree1|\
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alfa-network,tube-e4g)
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[ "$(fw_printenv -n dual_image 2>/dev/null)" = "1" ] &&\
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[ -n "$(find_mtd_part backup)" ] && {
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PART_NAME=backup
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if [ "$(fw_printenv -n bootactive 2>/dev/null)" = "1" ]; then
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fw_setenv bootactive 2 || exit 1
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else
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fw_setenv bootactive 1 || exit 1
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fi
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}
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default_do_upgrade "$1"
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;;
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hc5962|\
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r6220|\
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netgear,r6350|\
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