Nando wrote:
It's great to have hdparm output added. Another fixup that would be
needed would be setting the ATAPI cable mode to be 80pin, rather than
the slower 40pin. Users who add hard drives in place of PATA optical
drives are liked affected. Eg:
http://forum.notebookreview.com/showthread.php?p=5519419 (HP 2510P /
optical drive caddy)
http://www.gottabemobile.com/forum/forum_posts.asp?TID=8260&PID=55271
<http://www.gottabemobile.com/forum/forum_posts.asp?TID=8260&PID=55271> (Dell
XT / not sure why)
Comments/suggestions?
AFAICS this is not possible:
Cable detection can be done either by host sensing the PDIAG:CBLID
signal, by relying on sensing info from the device, or a combination of
both. This is rather complex such that false results may be not
unlikely. The device reports the state of PDIAG:CBLID in IDENTIFY word
93. The original Linux hdparm prints this info as:
"HW reset results: CBLID- above/below Vih".
(I will add this to GRUB hdparm).
There is no standard ATA command to change what the device reports in
word 93. The host OS driver may or may not use this info from the device
to detect cable type.
Reference: T13/1532D Vol 2 Rev 4b (ATA-7 Parallel Transport) section
8.2.11 and annex D.
Christian
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