[FS#3539] ramips/mt7620 snapshot does not boot

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Thomas Reifferscheid (reiffert) 

Attached to Project - OpenWrt/LEDE Project
Summary - ramips/mt7620 snapshot does not boot
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - It's happening on
- ramips/mt7620 D-Link DWR 960 with the snapshot of 2020/12/26
- r14281 from 2020/08/26 is working good.

- Steps to reproduce:

Install the factory image onto the stock firmware - or - install the sysupgrade onto the running r14281.

- Findings:

The snapshot version is booted when attempting to get into JBOOT but doesn't come up automatically.

Please guide/advise. Thank you.
Thomas


- Console output:

1. Regular/Working:
CDG56CDL_0T3 Jboot B972
JRecovery Version R1.2 2016/11/15 14:11
spi device id: ef 40 18 0 0 (40180000)
SPI FLASH: W25Q128FV 16M
.
....................
Starting kernel @ 80000000 ...


2. Bricked state, regular boot:
CDG56CDL_0T3 Jboot B972
JRecovery Version R1.2 2016/11/15 14:11
spi device id: ef 40 18 0 0 (40180000)
SPI FLASH: W25Q128FV 16M
.
.


3. Bricked state, booting into JBOOT (Hold reset button, power on)
CDG56CDL_0T3 Jboot B972
JRecovery Version R1.2 2016/11/15 14:11
spi device id: ef 40 18 0 0 (40180000)
SPI FLASH: W25Q128FV 16M
.
Reset button had been pressed.    
....................
Starting kernel @ 80000000 ...
and the snapshot is booted

4. JBOOT in working state:

CDG56CDL_0T3 Jboot B972
JRecovery Version R1.2 2016/11/15 14:11
spi device id: ef 40 18 0 0 (40180000)
SPI FLASH: W25Q128FV 16M
.
Reset button had been pressed.
Reset button had been pressed
IP = 192.168.123.254 NA = XX:XX:XX:XX:XX:XX




mtd layout on working r14281 (2020/08/26):
root at OpenWrt:~# cat /proc/mtd 
dev:    size   erasesize  name
mtd0: 00010000 00001000 "jboot"
mtd1: 00fe0000 00001000 "firmware"
mtd2: 001fc82e 00001000 "kernel"
mtd3: 00de37d2 00001000 "rootfs"
mtd4: 00b4d000 00001000 "rootfs_data"
mtd5: 00010000 00001000 "config"
root at OpenWrt:~# 





More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3539

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