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brcm2708: implement sysupgrade image check

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Implement a crude but functioning sysupgrade image check for the
Raspberry Pi. The code only checks if the master boot record boot
signature (0x55aa) is present in the first 512-bytes at the correct
location. This can prevent the odd bricking of a system when flashing
the wrong file.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
This commit is contained in:
Christian Lamparter 2016-04-07 18:26:51 +02:00 committed by Álvaro Fernández Rojas
parent 9dee77795d
commit 3339f41d26
1 changed files with 15 additions and 1 deletions
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16
target/linux/brcm2708/base-files/lib/upgrade/platform.sh
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@ -1,5 +1,19 @@
get_magic_at() {
local file="$1"
local pos="$2"
get_image "$file" | dd bs=1 count=2 skip="$pos" 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
}
platform_check_image() {
# i know no way to verify the image
local file="$1"
local magic
magic=$(get_magic_at "$file" 510)
[ "$magic" != "55aa" ] && {
echo "Failed to verify MBR boot signature."
return 1
}
return 0;
}