Adding support for TP-Link Archer MR200 v6 - LZMA ERROR 1

For Developers
1

Hi, I have almost completed the port of MR200 v6 to OpenWrt but when I try to reboot into sysupgrade from initramfs-kernel version, it throws an error in U-Boot

 Uncompressing Kernel Image … LZMA ERROR 1

I tried removing compression on the kernel image and that seems to work for the initramfs-kernel version but when i flash the sysupgrade it hangs with

Starting kernel....

I think it may be related to the tplink v3 header but I can't figure it out.

I also tried lzma-loader but that did not seem to help.

Please see https://github.com/openwrt/openwrt/pull/15610 for more details.

Any ideas?

2

Reduce memory requirements for decompression by adding KERNEL and KERNEL_INITRAMFS to file mt7628.mk:

define Device/tplink_archer-mr200-v6
  $(Device/tplink-v2)

  KERNEL := kernel-bin | append-dtb | lzma -d22
  KERNEL_INITRAMFS := kernel-bin | append-dtb | lzma -d22 | tplink-v2-header -e
3

Thanks, your solution helped for the sysupgrade.bin, but I needed to remove the tplink header completely from KERNEL_INITRAMFS, and let it boot with an uncompressed kernel with tftpboot. Also, the vendor tplink header has some fields in different endian, which I flipped with hex editor before flashing with sysupgrade -n -F sysupgrade.bin. It seemed to be missing the metadata without -F and complained. Then on reboot it booted but could not find root partition:

[    1.034343] MTD: Couldn't look up '': -22
[    1.038693] /dev/root: Can't open blockdev
[    1.042883] VFS: Cannot open root device "" or unknown-block(0,0): error -6
[    1.049984] Please append a correct "root=" boot option; here are the available partitions:
[    1.058477] 1f00             128 mtdblock0 
[    1.058492]  (driver?)
[    1.065119] 1f01           16000 mtdblock1 
[    1.065132]  (driver?)
[    1.071776] 1f02              64 mtdblock2 
[    1.071788]  (driver?)
[    1.078444] 1f03              64 mtdblock3 
[    1.078458]  (driver?)
[    1.085084] 1f04              64 mtdblock4 
[    1.085096]  (driver?)
[    1.091738] List of all bdev filesystems:
[    1.095801]  squashfs
[    1.095807] 
[    1.099628] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[    1.108012] Rebooting in 1 seconds..

So my remaining question is how do I pass the root= boot parameter to the kernel and what should it be?