DSFlash2 (DS Linker, N-Card et al.) programming

Known types:

- Hynix HY27UF081G2M - Samsung K9G8G08U0M

TODO: Figure out card timings. (Are all of them stored in RAM?)

- aabb - 000 ~ 7FE, in increments of 2

- aabb - 000 ~ 7FF

Returns 4 bytes - repeated byte containing:

- bits 0-6: ? - bit 7: READY/BUSY OUTPUT pin?

Returns 4 bytes - repeated byte containing bits 0-7 on the I/O pins. Used for reading the status rgister.

TODO

- aabbccdd: Address (MSB to LSB)

Returns 512 bytes.

Expects 512 bytes.

- pp: First byte of page (second byte onwards follow)