[FS#87] Kernel hangs at boot for mediatek mt7621

[LEDE Bugs]

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

User who did this - cidus (cidus) 

Attached to Project - LEDE Project
Summary - Kernel hangs at boot for mediatek mt7621
Task Type - Bug Report
Category - Kernel
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - I have a MediaTek MT7621 and since 28 Jul (commit: master/6b5a4185122b8c9edfb16e0ac70802733191ffe7) completly hangs at boot.

Here the relevant output:
[    0.000000] SoC Type: MediaTek MT7621 ver:1 eco:3
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 0001992f (MIPS 1004Kc)
[    0.000000] MIPS: machine is ZBT-WG3526
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 1c000000 @ 00000000 (usable)
[    0.000000]  memory: 04000000 @ 20000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x000000000fffffff]
[    0.000000]   HighMem  [mem 0x0000000010000000-0x0000000023ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x000000001bffffff]
[    0.000000]   node   0: [mem 0x0000000020000000-0x0000000023ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000023ffffff]

System configured with:
* Target System (MediaTek Ralink MIPS)
* Subtarget (MT7621 based boards)
* Target Profile (ZBT WG3526)

Removing the code let the board boot again event with last head.



More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=87