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我编译linux内核,根文件系统和u-boot并将映像复制到SD卡:分区0:启动分区1:rootfs和linux内核
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 >
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