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Update help-uboot.md 

fix flash reading scripts
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Paul Philippov 2022-07-04 17:41:42 -04:00 committed by GitHub
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@ -31,19 +31,31 @@ like this:
$ screen -L -Logfile fulldump.log /dev/ttyUSB0 115200
```
After connecting to bootloader console, run a command for reading hexadecimal
dump of data from the very beginning of the flash memery to the very end of it.
After connecting to the bootloader console, run a set of commands for reading
whole amount of data from flash memory chip into RAM, and then dumping it as
hexadecimal values into terminal window.
Use hexadecimal notation for addresses, where 0 is 0x0, 8 MB is 8x00000, and
16 MB is 0x1000000.
For reading whole 8 MB flash memory run
```
sf probe 0
mw.b 0x82000000 ff 0x800000
sf read 0x82000000 0x0 0x800000
md.b 0x0 0x800000
```
and for 16 MB flash memory run
```
sf probe 0
mw.b 0x82000000 ff 0x1000000
sf read 0x82000000 0x0 0x1000000
md.b 0x0 0x1000000
```
Since the process of reading is going to take a considerable amount of time
(literally hours), you might want to disconnect from the terminal session to
avoid accidental keystrokes contaminating the output. Press `Ctrl-a` followed