determine spi flash memory map or find free space in flash for log storage

[sijskes]

When interesting logs have been recorded in the field, it would be nice if they could be saved for later dmesg retrieval and survive power off.

A hotkey pressed will store the current syslog into the spiflash.

[aeickho]

• 0x100000 + 538 kb ( "DMR-ID to OM Info") maybe 1MByte?
• 0x200000 + 500 kb( "Call to DMR-ID" INDEX) .. maybe 1MByte? (not used on MASTER yet) https://github.com/aeickho/md380tools/tree/find_id/

DF7XS, 2624759
DF8AT, 2623355
DF8AV, 2623666, 2623712
DF8AY, 2623181, 2623789
DF8DL, 2624065
...

spi flash memory from 0x300000 is free .. and can be used