MT7688 u-boot debug

When porting uboot to MT7688, this bug  occurred

 

Uboot Log:

U-Boot 1.1.3 (Aug 26 2015 – 18:48:36)

Widora by mango,V1.0.1

Board: Ralink APSoC DRAM: 512 kB 
relocate_code Pointer at: 80034000

(system hang on here…)

 

My analysis is as below:

” Board: Ralink APSoC DRAM: 512 kB ”  the DDR2 is  not properly identified.  accurately my board ddr2 size is  64MB.

(1)   Hardware bug, maybe some DDR2 address lines disconnect.

(2)   Software  bug, maybe the detect ddr2 size code has bugs. or  not support this DDR2 (EtronTech EM68B16CWQH-25H)

 

Fixed Bug:

this is a hardware bug,  re-solder the MT7688 and DDR2, then ok!