在ubuntu18.04下载了uuu，可以用uuu u-boot.imx烧录uboot放到内存里，没有报错。
终端有如下提示：
any@Any-Desktop:~/imx6ul/ebf_6ull_buildroot/output/images$ ~/imx6ul/mfgtools/uuu/uuu u-boot.imx
uuu (Universal Update Utility) for nxp imx chips -- lib1.3.124-0-gee3f09a
Success 1 Failure 0
尝试用uuu -b emmc u-boot.imx烧录uboot到emmc里，没有提示成功，也没有提示失败。
any@Any-Desktop:~/imx6ul/ebf_6ull_buildroot/output/images$ ~/imx6ul/mfgtools/uuu/uuu -b emmc u-boot.imx
uuu (Universal Update Utility) for nxp imx chips -- lib1.3.124-0-gee3f09a
Success 0 Failure 0 1:31
1/ 1 [=================100%=================] SDP: boot -f u-boot.imx
以上两种情况下，串口输出信息如下：
U-Boot 2016.03 (Jan 08 2020 - 16:59:37 +0800)
CPU: Freescale i.MX6ULL rev1.1 69 MHz (running at 396 MHz)
CPU: Industrial temperature grade (-40C to 105C) at 46C
Reset cause: POR
Board: MX6ULL 14x14 EVK
I2C: ready
DRAM: 512 MiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1
MMC: no card present
*** Warning - MMC init failed, using default environment
In: serial
Out: serial
Err: serial
MMC: no card present
Net: FEC1
Error: FEC1 address not set.
Boot from USB for mfgtools
Use default environment for mfgtools
Run bootcmd_mfg: run mfgtool_args;bootz ${loadaddr} ${initrd_addr;
Hit any key to stop autoboot: 0
Bad Linux ARM zImage magic! =>
请问，我是哪里搞错了？
