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ata: Improve heuristics for detecting SSDs

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mSATA devices should be new enough to report their form factor proprerly

Change-Id: I2605c8ee0c97432e6e03bd78719e12bb14837f8d
This commit is contained in:
Solomon Peachy 2022-11-27 00:57:57 -05:00
parent 3f4e55a872
commit 0c7394e39a
1 changed files with 16 additions and 13 deletions
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29
firmware/drivers/ata.c
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@ -389,25 +389,28 @@ static ICODE_ATTR void copy_write_sectors(const unsigned char* buf,
int ata_disk_isssd(void)
{
/*
offset 217 is "Nominal Rotation rate"
0x0000 == Not reported
0x0001 == Solid State
0x0401 -> 0xffe == RPM
All others reserved
Offset 217 is "Nominal Rotation rate"
0x0000 == Not reported
0x0001 == Solid State
0x0401 -> 0xffe == RPM
All others reserved
Some CF cards return 0x0100 (ie byteswapped 0x0001) so accept either.
Some CF cards return 0x0100 (ie byteswapped 0x0001) so accept either.
However, this is a relatively recent change, and we can't rely on it,
especially for the FC1307A CF->SD adapters!
However, this is a very recent change, and we can't rely on it,
especially for the FC1307A CF->SD adapters.
Offset 167 is "Nominal Form Factor"
all values >= 0x06 are guaranteed to be solid State.
So we have to resort to other heuristics.
Offset 83 b2 and/or 86 b2 is set to show device implementes CFA commands
offset 83 b2 is set to show device implementes CFA commands
offset 0 is 0x848a for CF, but that's not guaranteed, because reasons.
Offset 169 b0 is set to show device implements TRIM.
These don't guarantee this is an SSD but it's better than nothing.
Offset 0 is 0x848a for CF, but that's not guaranteed, because reasons.
*/
return (identify_info[83] & (1<<2) ||
return (identify_info[83] & (1<<2) || identify_info[86] & (1<<2) ||
(identify_info[168] & 0x0f) >= 0x06 ||
identify_info[169] & (1<<0) ||
identify_info[217] == 0x0001 || identify_info[217] == 0x0100);
}