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ata: Advertise multiword DMA support #214

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Merged
dingusdev merged 1 commit into from
Aug 16, 2026
+5 −3
Merged

ata: Advertise multiword DMA support #214

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8 changes: 5 additions & 3 deletions devices/common/ata/atahd.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -289,7 +289,7 @@ void AtaHardDisk::prepare_identify_info() {
std::memset(this->data_buf, 0, sizeof(this->data_buf));

WRITE_WORD_LE_A(&buf_ptr[ 0], 0x0040); // ATA device, non-removable media, non-removable drive
WRITE_WORD_LE_A(&buf_ptr[49], 0x0200); // report LBA support
WRITE_WORD_LE_A(&buf_ptr[49], 0x0300); // report DMA and LBA support

// Maximum number of logical sectors per data block that the device supports
// for READ_MULTIPLE/WRITE_MULTIPLE commands.
Expand All @@ -307,15 +307,17 @@ void AtaHardDisk::prepare_identify_info() {

WRITE_WORD_LE_A(&buf_ptr[51], 0x0200); // max. PIO mode for a basic device

// report validity for the advanced PIO and MWDMA fields
//WRITE_WORD_LE_A(&buf_ptr[53], 0x0003);
// report validity for the MWDMA fields
WRITE_WORD_LE_A(&buf_ptr[53], 0x0002);

WRITE_DWORD_LE_A(&buf_ptr[57], this->total_sectors);

// report LBA capacity
WRITE_DWORD_LE_A(&buf_ptr[60], this->total_sectors);

WRITE_WORD_LE_A(&buf_ptr[63], ((1 << this->cur_dma_mode) << 8) | 7);
WRITE_WORD_LE_A(&buf_ptr[65], 120); // minimum MWDMA cycle time (ns)
WRITE_WORD_LE_A(&buf_ptr[66], 120); // recommended MWDMA cycle time (ns)
}

uint64_t AtaHardDisk::get_lba() {
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