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各位老师，
我跟着教程操作，将ubuntu解压到到2G的TF卡之后，也建立了sdupdate文件夹，将uboot和zImage,zImage_sd复制到了sdupdate文件夹中。
之后，我将tf卡插入开发板，格式化EMMC之后，执行到这一步出现了错误：
iTOP-4412 # sdfuse flash bootloader u-boot-iTOP-4412.bin
SD sclk_mmc is 400K HZ
SD sclk_mmc is 50000K HZ
SD sclk_mmc is 50000K HZ
[Fusing Image from SD Card.]
[Partition table on MoviNAND]
ptn 0 name='bootloader' start=0x0 len=N/A (use hard-coded info. (cmd: movi))
ptn 1 name='kernel' start=N/A len=N/A (use hard-coded info. (cmd: movi))
ptn 2 name='ramdisk' start=N/A len=0x300000(~3072KB) (use hard-coded info. (cmd: movi))
ptn 3 name='Recovery' start=N/A len=0x600000(~6144KB) (use hard-coded info. (cmd: movi))
ptn 4 name='system' start=0x1235400 len=0x6A4A0C00(~1741443KB)
ptn 5 name='userdata' start=0x6B6D6000 len=0x12E40C00(~309507KB)
ptn 6 name='cache' start=0x7E516C00 len=0x12E40C00(~309507KB)
ptn 7 name='fat' start=0x91357800 len=0x56F17800(~1424478KB)
Partition: bootloader, File: /sdupdate/u-boot-iTOP-4412.bin
Partition1: Start Address(0x38cd84), Size(0x281fa)
reading /sdupdate/u-boot-iTOP-4412.bin
Failed to read /sdupdate/u-boot-iTOP-4412.bin
我的薄码开关位置是0111
烧写zimage时也是同样的错误。
请教各位老师，这个问题应该怎么解决？
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