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08e976af26
This adds support for dual-image ('rootfs' partitions rotation), for
the YunCore AX840 board. Implementation details are included in the
'base-files' patch this commit adds:
0060-base-files-minimal-support-for-QCA-runtime-failsafe.patch
Fixes: WIFI-12537
Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>
117 lines
4.6 KiB
Diff
117 lines
4.6 KiB
Diff
From 793e3c02cd7ce6392913031b1f546923d4277f50 Mon Sep 17 00:00:00 2001
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From: Piotr Dymacz <pepe2k@gmail.com>
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Date: Sun, 6 Nov 2022 10:22:42 +0100
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Subject: [PATCH] base-files: minimal support for QCA runtime failsafe upgrade
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During research, when working on support for YunCore AX840 board it was
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found that this vendor decided to use Qualcomm-made, so called 'runtime
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failsafe' based upgrades from QSDK (see e.g. [1] and [2]).
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It turned out that vendor firmware makes use of dual-image feature
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controlled by SBL (not only by U-Boot as usual). This mode allows to
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switch between two copies of firmware in case of a failed upgrade and
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works not only with kernel/rootfs but apparently, also with other parts
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of the firmware, like APPS (U-Boot), Wi-Fi (ath11k) firmware, etc.
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Here, we will focus only on the firmware (in our case, UBI on NAND).
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Two, equal in size, UBI partitions are used: the 'rootfs' is always the
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active one (for booting) and 'rootfs_1' is used for storing new firmware
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during the regular 'sysupgrade'. Partition names are swapped, probably
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by the 'SBL' (closed-source, second level bootloader), based on layout
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in 'MIBIB' and content of 'BOOTCONFIG'/'BOOTCONFIG1' partitions (the
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second one seems to be only a backup, as mentioned in related kernel
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driver) and then provided by 'SMEM' to U-Boot and kernel. For example:
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- when primary 'rootfs' partition is #0:
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0x000000000000-0x000003c00000 : "rootfs" (used for booting)
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0x000003c00000-0x000007800000 : "rootfs_1"
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- when primary 'rootfs' partition is #1:
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0x000000000000-0x000003c00000 : "rootfs_1"
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0x000003c00000-0x000007800000 : "rootfs" (used for booting)
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The whole solution requires support in several other places, including
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kernel (detecting crash) and U-Boot (partition swap) but this requires
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more research and apparently, YunCore doesn't even use all of that in a
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proper way, resulting only in a rotation of firmware partitions during
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upgrade (without the part responsible for reverting in case of fail
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during the upgrade).
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This patch adds only a small part of the solution, making 'dual-image'
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feature kind of working, resulting in rotation between 'rootfs' and
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'rootfs_1' partitions (areas on NAND) between subsequent updates. This
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requires also 'CONFIG_BOOTCONFIG_PARTITION' support in the kernel and
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in simple terms, works as follows:
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1. Get name of target 'rootfs' partition for upgrade from:
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'/proc/boot_info/rootfs/upgradepartition'
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2. Perform upgrade and in case of success change 'primaryboot' flag
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(1 -> 0, 0 -> 1) for 'rootfs' partition in 'BOOTCONFIG'
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3. Write back updated 'BOOTCONFIG' content to flash:
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from '/proc/boot_info/getbinary_bootconfig' to mtd partitions
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('0:BOOTCONFIG' and '0:BOOTCONFIG1')
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This topic definitely requires additional research if a proper solution
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(kernel crash and/or failed upgrade detection) is needed so more changes
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might come in future.
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[1] https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/commit/67225a559ca8e61e87c36a1c9940a085b3950c97
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[2] https://git.codelinaro.org/clo/qsdk/oss/system/openwrt_repo/-/blob/NHSS.QSDK.12.1.5.r2/target/linux/ipq60xx/base-files/lib/upgrade/platform.sh#L175
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Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>
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---
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package/base-files/files/lib/upgrade/nand.sh | 25 ++++++++++++++++++++
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1 file changed, 25 insertions(+)
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diff --git a/package/base-files/files/lib/upgrade/nand.sh b/package/base-files/files/lib/upgrade/nand.sh
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index ab3db4cdf2..349d287841 100644
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--- a/package/base-files/files/lib/upgrade/nand.sh
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+++ b/package/base-files/files/lib/upgrade/nand.sh
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@@ -15,6 +15,9 @@ CI_ROOTPART="${CI_ROOTPART:-rootfs}"
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# ipq807x qsdk kernel misbehaves
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CI_IPQ807X=0
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+# update BOOTCONFIG partitions (rotate rootfs/rootfs_1)
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+CI_BOOTCFG=0
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+
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ubi_mknod() {
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local dir="$1"
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local dev="/dev/$(basename $dir)"
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@@ -216,9 +219,31 @@ nand_upgrade_prepare_ubi() {
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return 0
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}
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+nand_qca_update_bootconfig() {
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+ local primary="0"
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+ local mtdnum
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+ local part
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+
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+ [ -f /proc/boot_info/rootfs/primaryboot ] || return
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+ [ -f /proc/boot_info/getbinary_bootconfig ] || return
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+
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+ [ "$(cat /proc/boot_info/rootfs/primaryboot)" = "0" ] && primary="1"
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+ echo "$primary" > /proc/boot_info/rootfs/primaryboot 2>/dev/null
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+
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+ for part in "0:BOOTCONFIG" "0:BOOTCONFIG1"; do
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+ mtdnum="$(find_mtd_index "$part")"
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+ [ -c "/dev/mtd${mtdnum}" ] && {
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+ mtd -qq write /proc/boot_info/getbinary_bootconfig \
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+ "/dev/mtd${mtdnum}" 2>/dev/null &&\
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+ echo "partition '$part' updated"
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+ }
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+ done
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+}
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+
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nand_do_upgrade_success() {
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local conf_tar="/tmp/sysupgrade.tgz"
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sync
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+ [ "$CI_BOOTCFG" = 1 ] && nand_qca_update_bootconfig
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[ -f "$conf_tar" ] && nand_restore_config "$conf_tar"
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echo "sysupgrade successful"
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umount -a
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--
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2.38.1
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