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[PR #104] ide/core.c - ATA Version Support Bits are Incorrect #194

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opened 2026-01-31 21:30:12 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 21:30:12 +00:00
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Original Pull Request: https://github.com/qemu/qemu/pull/104

State: closed
Merged: No

This field Major Version Number field is presently reporting support for ATA-4 through ATA-7.
Bitfield[80] is defined in the ATA-6 specification below.

0xF0 = (1<<7) | (1<<6) | (1 << 5) | (1 << 4) // 4-7 - current settings
0x78 = (1<<6) | (1<<5) | (1 << 4) | (1 << 3) // 3-6 - new settings

Either the comment is wrong, or the field is wrong. If the field is wrong it can cause errors in drivers that check support vs conformity. This will not break most guests, since the conformity field is set to ATA-5.

I'm not sure whether this component support ATA-7, but since it's commented as if it supports up through 6, correcting the field assignment seems more correct.

ATA/ATAPI-6 Specification
https://web.archive.org/web/20200124094822/https://www.t13.org/Documents/UploadedDocuments/project/d1410r3b-ATA-ATAPI-6.pdf

Page 116
80 - M Major version number
0000h or FFFFh = device does not report version
F 15 Reserved
F 14 Reserved for ATA/ATAPI-14
F 13 Reserved for ATA/ATAPI-13
F 12 Reserved for ATA/ATAPI-12
F 11 Reserved for ATA/ATAPI-11
F 10 Reserved for ATA/ATAPI-10
F 9 Reserved for ATA/ATAPI-9
F 8 Reserved for ATA/ATAPI-8
F 7 Reserved for ATA/ATAPI-7
F 6 1 = supports ATA/ATAPI-6
F 5 1 = supports ATA/ATAPI-5
F 4 1 = supports ATA/ATAPI-4
F 3 1 = supports ATA-3
X 2 Obsolete
X 1 Obsolete
F 0 Reserved

**Original Pull Request:** https://github.com/qemu/qemu/pull/104 **State:** closed **Merged:** No --- This field Major Version Number field is presently reporting support for ATA-4 through ATA-7. Bitfield[80] is defined in the ATA-6 specification below. 0xF0 = (1<<7) | (1<<6) | (1 << 5) | (1 << 4) // 4-7 - current settings 0x78 = (1<<6) | (1<<5) | (1 << 4) | (1 << 3) // 3-6 - new settings Either the comment is wrong, or the field is wrong. If the field is wrong it can cause errors in drivers that check support vs conformity. This will not break most guests, since the conformity field is set to ATA-5. I'm not sure whether this component support ATA-7, but since it's commented as if it supports up through 6, correcting the field assignment seems more correct. ATA/ATAPI-6 Specification https://web.archive.org/web/20200124094822/https://www.t13.org/Documents/UploadedDocuments/project/d1410r3b-ATA-ATAPI-6.pdf Page 116 80 - M Major version number 0000h or FFFFh = device does not report version F 15 Reserved F 14 Reserved for ATA/ATAPI-14 F 13 Reserved for ATA/ATAPI-13 F 12 Reserved for ATA/ATAPI-12 F 11 Reserved for ATA/ATAPI-11 F 10 Reserved for ATA/ATAPI-10 F 9 Reserved for ATA/ATAPI-9 F 8 Reserved for ATA/ATAPI-8 F 7 Reserved for ATA/ATAPI-7 F 6 1 = supports ATA/ATAPI-6 F 5 1 = supports ATA/ATAPI-5 F 4 1 = supports ATA/ATAPI-4 F 3 1 = supports ATA-3 X 2 Obsolete X 1 Obsolete F 0 Reserved
claunia added the pull-request label 2026-01-31 21:30:12 +00:00
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Reference: starred/qemu#194
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