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)

diff --git a/target/linux/ramips/base-files/etc/init.d/bootcount b/target/linux/ramips/base-files/etc/init.d/bootcount
index 0f260fa3fc67f9bb44d8273a25b1d4549f41ee79..12326de0e3ad3a49a81ecba44c78fd1297d2d411 100755 (executable)
--- a/target/linux/ramips/base-files/etc/init.d/bootcount
+++ b/target/linux/ramips/base-files/etc/init.d/bootcount
@@ -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
 }

diff --git a/target/linux/ramips/base-files/lib/upgrade/platform.sh b/target/linux/ramips/base-files/lib/upgrade/platform.sh
index c4a09cb40e9f50f18182555156226fd0d645f303..eff2ba967cdcc7b8395b0ebcf260915d97503352 100755 (executable)
--- a/target/linux/ramips/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ramips/base-files/lib/upgrade/platform.sh
@@ -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|\