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Restoring PogoplugPro (OXNAS) to stock uBoot and stock rootfs.

Posted by noah 
Restoring PogoplugPro (OXNAS) to stock uBoot and stock rootfs.
May 05, 2021 07:58AM
I am bit lost with this subject.

In the past I have flashed Bodhi uboot (for debian), but unfortunatly boot from usbstick was never stable for me.

Current state:
U-Boot SPL 2013.10-tld-4 (Sep 07 2014 - 14:10:12)
Boot device: NAND
Attempting to set PLLA to 850 MHz ...
plla_ctrl0 : 0000020a
plla_ctrl1 : 00330000
plla_ctrl2 : 0065008b
plla_ctrl3 : 000000f1

PLLA Set
U-Boot 2015.10-tld-3 (Dec 08 2018 - 03:07:20 -0800)
OXNAS OX820
...

OX820> mtd
mtd
device nand0 <41000000.nand>, # parts = 2
#: name size offset mask_flags
0: boot 0x00e00000 0x00000000 0
1: data 0x07200000 0x00e00000 0

active partition: nand0,0 - (boot) 0x00e00000 @ 0x00000000

defaults:
mtdids : nand0=41000000.nand
mtdparts: mtdparts=41000000.nand:14m(boot),-(data)
OX820>



Lately, i tried openwrt 19.0.7, and after sysupgarde installation method (https://openwrt.org/toh/cloud_engines/pogoplugpro) it is booting from nand now.
But downside is that probaly it messed up my STOCK rootfs...

It seems to me that i am still able to boot (from Bodhi uboot) with stock kernel with that workaround:

setenv autoload n;
setenv bootargs_stock "root=ubi0:rootfs ubi.mtd=2,512 rootfstype=ubifs console=ttyS0,115200 elevator=cfq mac_adr=0x00,0x30,0xe0,0x00,0x00,0x01 mem=128M";
setenv poweroutage yes;
setenv boot "bootm 60500000";
setenv bootcmd_stock_fw "run set_bootargs_stock; run boot_nand";
setenv boot bootm 60500000;
setenv boot_nand "run load_nand boot || run load_nand2 boot";
setenv kernflmode s;
setenv load_nand2 "nboot 60500000 0 800000";
setenv load_nand "nboot 60500000 0 200000";
setenv set_bootargs_stock "setenv bootargs $bootargs_stock";
setenv mainlinelinux no;
run bootcmd_stock_fw
...
Loading from nand0, offset 0x200000
Image Name: Linux-2.6.31.6_SMP_820
Created: 2011-02-08 18:06:30 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2259824 Bytes = 2.2 MiB
Load Address: 60008000
Entry Point: 60008000
## Booting kernel from Legacy Image at 60500000 ...
Image Name: Linux-2.6.31.6_SMP_820
Created: 2011-02-08 18:06:30 UTC
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 2259824 Bytes = 2.2 MiB
Load Address: 60008000
Entry Point: 60008000
Verifying Checksum ... OK
Starting kernel ...

HOWEVER, stock rootfs is not coming up from nand:
....
[ 5.760000] UBIFS error (pid 1): ubifs_read_node: bad node type (4 but expected 6)
[ 5.770000] UBIFS error (pid 1): ubifs_read_node: bad node at LEB 0:0
[ 5.780000] List of all partitions:
[ 5.780000] 1f00 131072 mtdblock0 (driver?)
[ 5.780000] 1f01 14336 mtdblock1 (driver?)
[ 5.790000] 1f02 116736 mtdblock2 (driver?)
[ 5.790000] No filesystem could mount root, tried: ubifs
[ 5.800000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)
[ 5.810000] [<c002da64>] (unwind_backtrace+0x0/0xe8) from [<c03032b0>] (panic+0x44/0x104)
[ 5.820000] [<c03032b0>] (panic+0x44/0x104) from [<c00090e0>] (mount_block_root+0x264/0x2b4)
[ 5.820000] [<c00090e0>] (mount_block_root+0x264/0x2b4) from [<c0009220>] (prepare_namespace+0x8c/0x1bc)
[ 5.830000] [<c0009220>] (prepare_namespace+0x8c/0x1bc) from [<c0008598>] (kernel_init+0x1a8/0x1f0)
[ 5.840000] [<c0008598>] (kernel_init+0x1a8/0x1f0) from [<c0028ae0>] (kernel_thread_exit+0x0/0x8)
[ 5.850000] CPU1: stopping
[ 5.850000] [<c002da64>] (unwind_backtrace+0x0/0xe8) from [<c00272f8>] (do_IPI+0xe4/0x148)
[ 5.850000] [<c00272f8>] (do_IPI+0xe4/0x148) from [<c0027c18>] (__irq_svc+0x38/0xc0)
[ 5.870000] Exception stack(0xc7843f98 to 0xc7843fe0)
[ 5.870000] 3f80: c7842000 00000000
[ 5.870000] 3fa0: c7843fe0 00000000 c7842000 c0404804 c03e6314 c0404d30 00000000 410fb025
[ 5.870000] 3fc0: 60020c80 00000000 c0536748 c7843fe0 c0028b80 c0028b84 60000013 ffffffff
[ 5.900000] [<c0027c18>] (__irq_svc+0x38/0xc0) from [<c0028b84>] (default_idle+0x24/0x28)
[ 5.910000] [<c0028b84>] (default_idle+0x24/0x28) from [<c0029270>] (cpu_idle+0x64/0x98)
[ 5.910000] [<c0029270>] (cpu_idle+0x64/0x98) from [<60008084>] (0x60008084)

I want to revert to full stock nand, and start over from that.
I have some mtd0, mtd1, mtd2 backup dumps outside from plug, which i would like to try (i hope these are as originals as possible):

#ls -la
-rwxr--r-- 1 user1 users 134086656 Nov 17 14:08 mtd0
-rwxr--r-- 1 user1 users 14680064 Nov 17 14:08 mtd1
-rwxr--r-- 1 user1 users 119406592 Nov 17 14:08 mtd2

md5sum hashes for these backups:
# md5sum *
92e45d994190fa854ef64c88e66909c4 mtd0
9a6faf731ae81a58cf5b16bca3dff35f mtd1
24cb75ae1afc6ef3923ae88f547a2a83 mtd2

Also, stock nand layout was saved to file in backup time:
dev: size erasesize name
mtd0: 08000000 00020000 "NAND 128MiB 3,3V 8-bit"
mtd1: 00e00000 00020000 "boot"
mtd2: 07200000 00020000 "rootfs"

Can anyone confirm (by hashes) that these are really stock mtd's ? Or are stock mtd's availablbe somewhere for download?
How to proceed with restoring stock uboot, stock kernel, and stock rootfs?
I have tftp up and running, and have console access.
Does anyone knows where openwrt sysupgrade methods installes its rootfs in nand? Am I corrcect that is was flashed to
mtd2: 07200000 00020000 "rootfs" area?

br Noah'
Re: Restoring PogoplugPro (OXNAS) to stock uBoot and stock rootfs.
May 05, 2021 06:17PM
Noah,

Once you've installed OpenWrt to NAND, you will not be able to run stock FW.

-bodhi
===========================
Forum Wiki
bodhi's corner
Re: Restoring PogoplugPro (OXNAS) to stock uBoot and stock rootfs.
May 06, 2021 03:02AM
I dont want to run them as dual boot- I want to get rid of OpenWrt. And want to restore stock FW from backup.



Edited 1 time(s). Last edit at 05/06/2021 03:06AM by noah.
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