WhyCan Forum(哇酷开发者社区)

U-Boot 2018.11 (Apr 24 2020 - 22:07:55 +0800) Allwinner Technology

CPU:   Allwinner F Series (SUNIV)
Model: f1c200s
DRAM:  64 MiB
MMC:   SUNXI SD/MMC: 0
Setting up a 480x272 lcd console (overscan 0x0)
In:    serial@1c25400
Out:   serial@1c25400
Err:   serial@1c25400
Hit any key to stop autoboot:  0 
=> ums 
ums - Use the UMS [USB Mass Storage]

Usage:
ums <USB_controller> [<devtype>] <dev[:part]>  e.g. ums 0 mmc 0
    devtype defaults to mmc
=> ums 0
ums - Use the UMS [USB Mass Storage]

Usage:
ums <USB_controller> [<devtype>] <dev[:part]>  e.g. ums 0 mmc 0
    devtype defaults to mmc
=> ums 0 mmc 0
Card did not respond to voltage select!
=> ums 0 mmc 0
UMS: LUN 0, dev 0, hwpart 0, sector 0x0, count 0xe8ec00
Controller uninitialized
g_dnl_register: failed!, error: -6
g_dnl_register failed
=>