只有u-boot烧写到TF卡上，uboot启动也是正常的，但是屏幕没有显示出logo，而是花屏，难道是屏坏了，还是uboot有问题，uboot使用的是github上下载来的，也配置了480*272_defconfig.
这个是启动log，能否提供一个uboot，能点亮屏幕的。
U-Boot 2017.01-rc2-00057-g32ab1804cd (Mar 28 2020 - 22:15:25 +0800) Allwinner Technology
CPU: Allwinner V3s (SUN8I 1681)
Model: Lichee Pi Zero
DRAM: 64 MiB
MMC: SUNXI SD/MMC: 0
*** Warning - bad CRC, using default environment
Setting up a 480x272 lcd console (overscan 0x0)
dotclock: 10000kHz = 10000kHz: (1 * 3MHz * 20) / 6
In: serial@01c28000
Out: serial@01c28000
Err: serial@01c28000
Net: No ethernet found.
starting USB...
No controllers found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
starting USB...
No controllers found
USB is stopped. Please issue 'usb start' first.
starting USB...
No controllers found
No ethernet found.
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已经好了，屏幕分辨率不对称导致的，5吋的屏是800*480的，4.3吋的是480*272
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