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apm821xx: switch MR24's initramfs to multi-image method

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The recent change to switch to gcc 7.3 broke the image
generation code, as the kernel would no longer fit into
KERNEL_SIZE.

This patch fixes the issue by reworking the initramfs
creation and packaging, which will get rid of the
KERNEL_SIZE check in the process.

This new initramfs can be loaded through the MR24 U-boot
in the following way:

=> setenv ipaddr 192.168.1.1
=> setenv bootargs console=ttyS0,$baudrate
=> tftpboot c00000 192.168.1.2:meraki_mr24-initramfs-kernel.bin
[...]
Load address: 0xc00000
Loading: ################################################ [...]
done
    Bytes transferred = 5952544 (5ad420 hex)
    => bootm $fileaddr
    \## Booting kernel from Legacy Image at 00c00000 ...
    ...

For more information and the latest flashing guide:
please visit the OpenWrt Wiki Page for the MR24:
<https://openwrt.org/toh/meraki/mr24#flashing>

Cc: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Chris Blake <chrisrblake93@gmail.com>
This commit is contained in:
Christian Lamparter 2018-03-18 22:51:07 +01:00 committed by Hauke Mehrtens
parent 479aaf6375
commit e2b35f91b3
1 changed files with 3 additions and 7 deletions
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10
target/linux/apm821xx/image/Makefile
View file

@ -75,13 +75,9 @@ define Device/meraki_mr24
BLOCKSIZE := 63k
IMAGES := sysupgrade.tar
DTB_SIZE := 64512
KERNEL_SIZE := 1984k
IMAGE_SIZE := 8191k
KERNEL := kernel-bin | lzma | uImage lzma | MerakiAdd-dtb | MerakiNAND
KERNEL_INITRAMFS := copy-file $(KDIR)/vmlinux | lzma | uImage lzma | \
check-size $$(KERNEL_SIZE) | \
MerakiAdd-dtb | pad-to 2047k | MerakiAdd-initramfs | \
MerakiNAND
KERNEL_INITRAMFS := kernel-bin | lzma | dtb | MuImage-initramfs lzma
IMAGE/sysupgrade.tar := sysupgrade-tar | append-metadata
UBINIZE_OPTS := -E 5
SUPPORTED_DEVICES += mr24
@ -123,7 +119,7 @@ define Build/create-uImage-dtb
@mv $@.new $@
endef
define Build/wndr4700-specialImage
define Build/MuImage-initramfs
rm -rf $@.fakerd $@.new
dd if=/dev/zero of=$@.fakerd bs=32 count=1 conv=sync
@ -170,7 +166,7 @@ define Device/netgear_wndr4700
KERNEL_SIZE := 1920k
KERNEL := dtb | kernel-bin | lzma | uImage lzma | pad-offset $$(BLOCKSIZE) 64 | \
append-uImage-fakeroot-hdr
KERNEL_INITRAMFS := kernel-bin | gzip | dtb | wndr4700-specialImage gzip
KERNEL_INITRAMFS := kernel-bin | gzip | dtb | MuImage-initramfs gzip
IMAGE/factory.img := create-uImage-dtb | append-kernel | pad-to 2M | append-ubi | \
netgear-dni | check-size $$$$(IMAGE_SIZE)
IMAGE/sysupgrade.tar := sysupgrade-tar | append-metadata