STM32G bootloader questions

[Daewoong]

I'm trying bootloader of nucleo STM32G474RE and faced several issues :

1. It seems only 8bytes alignment is working for flash writing while AN2606 table.7 says it requires 4bytes alignment.
2. In an2606 table.141, valid RAM area is from 0x20000000 to 0x20004000. I failed to write in this area while I succeeded to write from 0x20004000 to upper area.
3. General question not limited to STM32G474RE. In an2606 table 141, there is a valid RAM area depending on PID. Is this not dependent to actual SRAM size ?

With 1 and 2, I think this is a typo of the manual.

Please kindly advise. Thanks in advance.

[TDK]

The bootloader needs some RAM to work with. Writing over that at 0x20000000 isn't going to work well. AN2606 should have details on how much RAM is used.