我是买的开发板,用直接下载的BOOT.bin能正常启动,我自己在xilinx官网下载的u-boot-xlnx-master.zip,生成BOOT.bin启动的时候出现下面的问题,MMC超时,请问是什么原因呀,我读mmc的信息也是显示超时
U-Boot 2014.01 (Dec 10 2014 - 21:42:04)
I2C: ready
Memory: ECC disabled
DRAM: 1 GiB
MMC: zynq_sdhci: 0
SF: Detected S25FL128S_64K with page size 512 Bytes, erase size 128 KiB, total 32 MiB
*** Warning - bad CRC, using default environment
In: serial
Out: serial
Err: serial
Net: Gem.e000b000
Hit any key to stop autoboot: 3 2 1 0
sdhci_send_command: MMC: 0 busy timeout increasing to: 200 ms.
sdhci_send_command: MMC: 0 busy timeout increasing to: 400 ms.
sdhci_send_command: MMC: 0 busy timeout increasing to: 800 ms.
sdhci_send_command: MMC: 0 busy timeout increasing to: 1600 ms.
sdhci_send_command: MMC: 0 busy timeout increasing to: 3200 ms.
sdhci_send_command: MMC: 0 busy timeout.
sdhci_send_command: MMC: 0 busy timeout.
sdhci_send_command: MMC: 0 busy timeout.
sdhci_send_command: MMC: 0 busy timeout.
sdhci_send_command: MMC: 0 busy timeout.
sdhci_send_command: MMC: 0 busy timeout.
zynq-uboot>
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