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ata: Prefer using "virtual" sector size where possible

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Normally, if a device uses larger physical sector size than the logical
size and supports so-called "512e" mode, we let the device deal with
partial sector reads/writes.

However, if MAX_VIRT_SECTOR_SIZE is defined, we support
partitioning/filesystems that use a larger "virtual" sector than the
logical sector.  typically this matches the physical sector size of the
drive, which means that despite a small logical sector size, all I/O
is done in terms of the physical sector size.

Therefore, when MAX_VIRT_SECTOR_SIZE and MAX_PHYS_SECTOR_SIZE are
enabled (currently only ipod5g and ipod6g), prefer software-based
partial sector I/O.

Change-Id: I0815ad0a2f987b89bb2debfbf3d0ed64cdf85525
This commit is contained in:
Solomon Peachy 2024-11-13 07:47:36 -05:00
parent 120906dc8b
commit 9bf033dd66
3 changed files with 24 additions and 0 deletions
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4
firmware/export/ata.h
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@ -235,4 +235,8 @@ int ata_read_smart(struct ata_smart_values*);
#define ATA_IDENTIFY_WORDS 256
#ifdef MAX_PHYS_SECTOR_SIZE
void ata_set_phys_sector_mult(unsigned int mult);
#endif
#endif /* __ATA_H__ */