FSPXI:ReadFileSHA256

Request

Index Word	Description
0	Header code [0x004D01C4]
1	File(/archive?) handle lower word
2	File handle upper word
3	Offset lower word
4	Offset upper word
5	Size of second memory block
6	Unknown (always 0x00001000)
7	Size of first memory block
8	(size of first mem block << 8) | 4
9	Pointer to first memory block
10	(size of second mem block << 8) | 0x14
11	Pointer to second memory block

Response

Index Word	Description
0	Header code
1	Result code
2	Size read
3	4

The data read are stored in the second memory block. The first memory block is filled with hashes, in an unknown manner.

Reads seem to be sector-aligned (one sector = 0x1000 bytes when reading from the cart, not sure if that is true everywhere). The first memory block seems to be filled with one hash per sector read.