hi,all
我们的板子是AM4379 GP EVM。以下是详细过程描述
// sysboot 由 uart0 启动
通过 Tera Term 终端。
1.接收到CCCCC
xmodem 载入 u-boot-spl.bin
2.接收到CC
ymodem 载入 u-boot.img
完成后显示以下信息：
U-Boot 2014.07 (Sep 26 2015 - 21:22:17)
I2C: ready
DRAM: 1 GiB
NAND: 512 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
Card did not respond to voltage select!
** Bad device mmc 0 **
Using default environment
on_baudrate op:0Incorrect magic number (0xffffffff) in EEPROM
Could not get board ID.
Net: <ethaddr> not set. Validating first E-fuse MAC
cpsw, usb_ether
Hit any key to stop autoboot: 1 0
WARNING: Could not determine device tree
Card did not respond to voltage select!
Card did not respond to voltage select!
(Re)start USB...
USB0: Register 2000440 NbrPorts 2
Starting the controller
USB XHCI 1.00
scanning bus 0 for devices... 1 USB Device(s) found
scanning usb for storage devices... 0 Storage Device(s) found
USB device 0: unknown device
Booting from nand ...
no devices available
no devices available
Bad Linux ARM zImage magic!
U-Boot#
在uboot命令行执行以下步骤：
//MLO
loadb 0x82000000
nand erase 0x00000000 0x00020000
nand write 0x82000000 0x00000000 0x00020000
//U-Boot
loadb 0x82000000
nand erase 0x00080000 0x001E0000
nand write 0x82000000 0x00080000 0x001E0000
都 提示写入ok.
出现问题1：
再次通过 uart0 启动时，NAND 大小变成0MiB。可以进到UBoot,查看 NAND 信息，显示 no devices available。
U-Boot 2014.07 (Sep 28 2015 - 10:00:51)
I2C: ready
DRAM: 1 GiB
NAND: 0 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
Card did not respond to voltage select!
** Bad device mmc 0 **
Using default environment
on_baudrate op:0Net: <ethaddr> not set. Validating first E-fuse MAC
cpsw, usb_ether
Hit any key to stop autoboot: 0
Card did not respond to voltage select!
Card did not respond to voltage select!
(Re)start USB...
USB0: Register 2000440 NbrPorts 2
Starting the controller
USB XHCI 1.00
scanning bus 0 for devices... 1 USB Device(s) found
scanning usb for storage devices... 0 Storage Device(s) found
USB device 0: unknown device
Booting from nand ...
no devices available
no devices available
Bad Linux ARM zImage magic!
U-Boot#
问题2：sysboot 改成由 nand 启动 失败：
U-Boot SPL 2014.07 (Sep 26 2015 - 20:48:26)
### ERROR ### Please RESET the board ###
nand flash 只能通过 uart0写入一次吗?
哪位大哥大姐知道这是什么原因造成的呢,请告知.非常感谢.
