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linux: amend uimage load address for proper decompression

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When kernel image is compressed, it is first loaded
to RAM at load address specified in command line,
then unpacks to loadaddr provided by uImage.

For decompressed image not to overwrite compressed
data, uncompressed image load address needs to be
shifted by compressed image size + 1 MiB alignment.
This commit is contained in:
kszaq 2019-05-02 10:44:57 +02:00
parent bc04a40adb
commit 42a4f1c69d
1 changed files with 11 additions and 0 deletions
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11
packages/linux/package.mk
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@ -243,8 +243,19 @@ make_target() {
fi
if [ -n "$KERNEL_UIMAGE_TARGET" ] ; then
# determine compression used for kernel image
KERNEL_UIMAGE_COMP=${KERNEL_UIMAGE_TARGET:7}
KERNEL_UIMAGE_COMP=${KERNEL_UIMAGE_COMP:-none}
# calculate new load address to make kernel Image unpack to memory area after compressed image
if [ "$KERNEL_UIMAGE_COMP" != "none" ] ; then
COMPRESSED_SIZE=$(stat -t "arch/$TARGET_KERNEL_ARCH/boot/$KERNEL_TARGET" | awk '{print $2}')
# align to 1 MiB
COMPRESSED_SIZE=$(( (($COMPRESSED_SIZE - 1 >> 20) + 1) << 20 ))
KERNEL_UIMAGE_LOADADDR=$(printf '%X' "$(( $KERNEL_UIMAGE_LOADADDR + $COMPRESSED_SIZE ))")
KERNEL_UIMAGE_ENTRYADDR=$(printf '%X' "$(( $KERNEL_UIMAGE_ENTRYADDR + $COMPRESSED_SIZE ))")
fi
mkimage -A $TARGET_KERNEL_ARCH \
-O linux \
-T kernel \