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apm821xx: Netgear WNDR4700 limit kernel lzma dictionary

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WNDR4700 uboot has an issue with decompressing kernel with default dictionary size (-d23 which is about 8MB).
Limiting lzma dictionary lowers memory footprint and allows device to boot the kernel.

The highest bootable dictonary size is 18, choosing 16 for an extra safety margin.

Kernel size befor and after:
-d23: 2663665 Bytes
-d16: 2892757 Bytes

Kernel size increased by 230kB (9%)

Fixes: FS#3258

Signed-off-by: Wiktor Stasiak <wiktor.stasiak@gmail.com>
This commit is contained in:
Wiktor Stasiak 2020-09-27 16:27:59 +02:00 committed by Petr Štetiar
parent 28262f815e
commit 1941ac06f0
1 changed files with 1 additions and 2 deletions
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3
target/linux/apm821xx/image/nand.mk
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@ -106,7 +106,7 @@ define Device/netgear_wndr4700
KERNEL_SIZE := 3584k
# append a fake/empty rootfs to fool netgear's uboot
# CHECK_DNI_FIRMWARE_ROOTFS_INTEGRITY in do_chk_dniimg()
KERNEL := kernel-bin | lzma | uImage lzma | pad-offset $$(BLOCKSIZE) 64 | \
KERNEL := kernel-bin | lzma -d16 | uImage lzma | pad-offset $$(BLOCKSIZE) 64 | \
append-uImage-fakehdr filesystem | dtb | create-uImage-dtb | prepend-dtb
KERNEL_INITRAMFS := kernel-bin | gzip | dtb | MuImage-initramfs gzip
IMAGE/factory.img := append-kernel | pad-to $$$$(KERNEL_SIZE) | append-ubi | \
@ -117,6 +117,5 @@ define Device/netgear_wndr4700
NETGEAR_HW_ID := 29763875+128+256
UBINIZE_OPTS := -E 5
SUPPORTED_DEVICES += wndr4700
DEFAULT := n
endef
TARGET_DEVICES += netgear_wndr4700