feature request: CRC for program memory #4165

I do occasionally struggle with failing flash chips and are implementing a CRC32. From 0x400000 to 0x410000-1 which is the SPI flash mapped to the memory map.
That part I got working, however, I need a matching, link-time generated CRC in memory.

Question:

1. is there a mechanism which does that already? (Would be awesome :-)
2. is there a linker option to place a (const) variable (my CRC) at a specific location in the memory, e.g. 0x410000-4 ?