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ramips: support dual image feature on ALFA Network boards

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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)
This commit is contained in:
Piotr Dymacz 2019-10-29 23:25:56 +01:00
parent ee71837e38
commit 7a62e909b2
2 changed files with 27 additions and 3 deletions
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13
target/linux/ramips/base-files/etc/init.d/bootcount
View File

@ -5,8 +5,15 @@ START=99
start() {
. /lib/functions.sh
local board=$(board_name)
if [ $board = "sk-wb8" ]; then
case $(board_name) in
alfa-network,ac1200rm|\
alfa-network,awusfree1|\
alfa-network,tube-e4g)
[ -n "$(fw_printenv bootcount bootchanged 2>/dev/null)" ] &&\
echo -e "bootcount\nbootchanged\n" | /usr/sbin/fw_setenv -s -
;;
sk-wb8)
fw_setenv bootcount 0
fi
;;
esac
}

17
target/linux/ramips/base-files/lib/upgrade/platform.sh
View File

@ -5,6 +5,9 @@
PART_NAME=firmware
REQUIRE_IMAGE_METADATA=1
RAMFS_COPY_BIN='fw_printenv fw_setenv'
RAMFS_COPY_DATA='/etc/fw_env.config /var/lock/fw_printenv.lock'
platform_check_image() {
return 0
}
@ -36,6 +39,20 @@ platform_do_upgrade() {
local board=$(board_name)
case "$board" in
alfa-network,ac1200rm|\
alfa-network,awusfree1|\
alfa-network,tube-e4g)
[ "$(fw_printenv -n dual_image 2>/dev/null)" = "1" ] &&\
[ -n "$(find_mtd_part backup)" ] && {
PART_NAME=backup
if [ "$(fw_printenv -n bootactive 2>/dev/null)" = "1" ]; then
fw_setenv bootactive 2 || exit 1
else
fw_setenv bootactive 1 || exit 1
fi
}
default_do_upgrade "$1"
;;
hc5962|\
r6220|\
netgear,r6350|\