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In the structure returned by the ATA identify device command, there are two fields which describe the device capacity. One is a 32 bit data type which reports the number of sectors as a 28 bit LBA, and the other is a 64 bit data type which is for a 48 bit LBA. If the device doesn't support 48 bit LBAs, the small value is the only value with the correct size. If it supports more, if the number of sectors is small enough to fit into 28 bits, both fields reflect the correct value. If it's too large, the smaller field has 28 bits of 1s, 0xfffffff, and the other field has the correct value. The AHCI driver is implemented by attaching to the generic SCSI code and translating on the fly between SCSI binary data structures and AHCI data structures. It responds to requests to execute specific SCSI commands by executing the equivalent AHCI commands and then crafting a response which matches what a SCSI disk would send. The AHCI driver now considers both fields and chooses the correct one when implementing both the SCSI READ CAPACITY (10) and READ CAPACITY (16) commands. Signed-off-by: Gabe Black <gabeblack@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org> |
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| .. | ||
| ahci.c | ||
| ata_piix.c | ||
| ata_piix.h | ||
| dwc_ahsata.c | ||
| dwc_ahsata.h | ||
| fsl_sata.c | ||
| fsl_sata.h | ||
| ftide020.c | ||
| ftide020.h | ||
| libata.c | ||
| Makefile | ||
| mvsata_ide.c | ||
| mxc_ata.c | ||
| pata_bfin.c | ||
| pata_bfin.h | ||
| sata_dwc.c | ||
| sata_dwc.h | ||
| sata_sil3114.c | ||
| sata_sil3114.h | ||
| sata_sil.c | ||
| sata_sil.h | ||
| sil680.c | ||
| sym53c8xx.c | ||
| systemace.c | ||