bootdelay参数设置为0怎么改回来？ -金沙js1005线路

    在使用myd-am3358开发板过程中把bootloader里面的bootdelay参数设置为0后，不能进入到uboot的命令里面，不能烧写内核镜像到开发板上了……这怎么办呢？

先来看该启动日志：
u-boot 2016.05 (oct 23 2018 - 11:36:24 0800)
       watchdog enabled
i2c:   ready
dram:  512 mib
nand:  512 mib
mmc:   omap sd/mmc: 0, omap sd/mmc: 1
net:   could not get phy for cpsw: addr 0
cpsw
hit any key to stop autoboot:  0 
switch to partitions #0, ok
mmc0 is current device
sd/mmc found on device 0
reading boot.scr
** unable to read file boot.scr **
** bad device specification 0x82000000 uenv **
usb is stopped. please issue 'usb start' first.
starting usb...
usb0:   scanning bus 0 for devices... 1 usb device(s) found
       scanning usb for storage devices... 0 storage device(s) found
usb device 0: unknown device
switch to partitions #0, ok
mmc0 is current device
switch to partitions #0, ok
mmc0 is current device
sd/mmc found on device 0
switch to partitions #0, ok
mmc0 is current device
sd/mmc found on device 0
reading boot.scr
** unable to read file boot.scr **
reading uenv.txt
708 bytes read in 4 ms (172.9 kib/s)
loaded env from uenv.txt
importing environment from mmc ...
3471064 bytes read in 230 ms (14.4 mib/s)
39405 bytes read in 26 ms (1.4 mib/s)
kernel image @ 0x82000000 [ 0x000000 - 0x34f6d8 ]
## flattened device tree blob at 88000000
   booting using the fdt blob at 0x88000000
   loading device tree to 8fff3000, end 8ffff9ec ... ok
fixing up eth0 & eth1 to cpsw ethernet

starting kernel ...

    看了完整的启动日志，我们可以使用下面的方法制作一个boot.scr文件，然后放到tf卡里面，再从tf卡启动。

1. 编写一个boot.cmd文本文件，内容如下
setenv bootdelay 2
saveenv
2. 制作一个boot.scr文件
mkimage -c none -a arm -t script -d boot.cmd boot.scr

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