linux-kernel - uboot-MMC 没有 SD 卡

Question

我正在尝试使用在 imx51 飞思卡尔板上运行的 linux rootfs 获取 linux 内核。

我编译了 linux 内核、根文件系统和 u-boot 并将镜像复制到 SD 卡:分区 0:引导分区 1:rootfs 和 linux 内核

但是我有以下错误:

U-Boot 2011.12 (Mar 13 2012 - 14:15:41)

CPU:   Freescale i.MX51 family rev3.0 at 800 MHz
Reset cause: POR
Board: MX51EVK
DRAM:  512 MiB
WARNING: Caches not enabled
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
MMC: no card present
MMC init failed
Using default environment

In:    serial
Out:   serial
Err:   serial
Net:   FEC
Warning: failed to set MAC address

Hit any key to stop autoboot:  0 
MX51EVK U-Boot > mmcinfo
MMC: no card present
Device: FSL_SDHC
Manufacturer ID: 0
OEM: 0
Name: Tran Speed: 0
Rd Block Len: 0
MMC version 0.0
High Capacity: No
Capacity: 0 Bytes
Bus Width: 0-bit
MX51EVK U-Boot > mmc init
mmc - MMC sub system

Usage:
mmc read addr blk# cnt
mmc write addr blk# cnt
mmc erase blk# cnt
mmc rescan
mmc part - lists available partition on current mmc device
mmc dev [dev] [part] - show or set current mmc device [partition]
mmc list - lists available devices
MX51EVK U-Boot > mmc list
FSL_SDHC: 0
 FSL_SDHC: 1
MX51EVK U-Boot > mmc dev
MMC: no card present
mmc0(part 0) is current device
MX51EVK U-Boot >

可能有什么问题？

Answer 1

检查 DIP 开关，我意识到开关设置为从底部插槽启动 SD 卡，而我一直从顶部插槽启动。因此，它解决了我的问题