mdt_debug write

[Stephen Graf]

Below is the consol log from trying to use mtd_debug write. It returned 
immediately with a strange success message.

root at orangepizero3:~# mtd_debug write /dev/mtd0 0 0xf0000 
/home/sysadmin/u-boot-sunxi-with-spl.bin
file_to_flash: fread, size 0xf0000, n 0xf0000
fread(): Success

I then used the cat command to write to the SPI flash which took a few 
seconds to execute:

root at orangepizero3:~# cat /home/sysadmin/u-boot-sunxi-with-spl.bin > 
/dev/mtd0



>>>
>>> I tried to follow the u-boot documentation on writing the SPI flash but
>>> had problems with the write command.  When issued it returned
>>> immediately. The erase command took about 5 sec to execute. I researched
>>> use of mtd commands and got a suggestion to use cat instead, which worked.
>>>
>>> "root at orangepizero3:~# mtdinfo
>>> Count of MTD devices:           1
>>> Present MTD devices:            mtd0
>>> Sysfs interface supported:      yes
>>> root at orangepizero3:~# mtd_debug erase /dev/mtd0 0 0xf0000
>>> Erased 983040 bytes from address 0x00000000 in flash
>>> root at orangepizero3:~# mtd_debug write /dev/mtd0 0 0xf0000
>>> /home/sysadmin/u-boot-sunxi-with-spl.bin
>>> file_to_flash: fread, size 0xf0000, n 0xf0000
>>> fread(): Success
>>> 
>>>