DF2480[0]: bio_offset=000000000007d000 -> u64 block=1000; cmd.arg=0x000003e8 (CORRECT)
DF2480[2]: bio_offset=0000020000000000 (2048 GiB) -> u64 block=4294967296 (0x100000000); verbatim code sent cmd.arg=0x00000000 (TRUNCATED/WRONG)
DF2480[3]: bio_offset=0000040000607200 -> u64 block=0x200003039; verbatim sent cmd.arg=0x00003039 (TRUNCATED/WRONG)
DF2480[4]: erase path (mmcsd_delete) same math
--- fixed source A/B ---
DF2480[2]: cmd.opcode=0 (NO command issued - bio rejected with EIO)