Allwinner A20开发相关问题汇总

• Boot1无法启动Uboot和Kernel

Succeed in loading Boot1.
Jump to Boot1.


[       2.538] fattype FAT16
[       2.540] fs mount ok
[       2.543] nand good_block_ratio=870
[       2.546] storage_type=0
[       2.558] 0
[       2.558] set pc
[       2.558] usbdc_vol = 4000, usbdc_cur = 100
[       2.560] usbpc_vol = 4400, usbpc_cur = 100
[       2.565] init to usb pc
[       2.568] set pc
[       2.649] battery enough
[       2.650] power_start=0x00000003
[       2.650] key value = 0
[       2.653] recovery key high 40, low 4
[       2.673] show pic finish
[       2.673] load kernel start
[       2.692] load kernel successed
[       2.692] start address = 0x4a000000
[       3.162] power exit detect
-------
enter standby

原因：扩展板不支持按键开机

对策：power_start = 3

• 更新nanda中script.bin不生效

原因: BOOT1中使能编译宏：SCRIPT_INSTALL_EARLY

对策: A20/lichee/boot/boot1/egon2.h中屏蔽SCRIPT_INSTALL_EARLY

• 使用LVDS屏显示时出现色块颜色不对现象

原因: 18bit显示的LVDS使用了24bit显示位宽

对策: lcd_lvds_bitwidth = 1