Re: kern/52126 (mvsata Marvell 88SX6081 panics on boot)

[mlelstv%serpens.de@localhost (Michael van Elst)]

The following reply was made to PR kern/52126; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/52126 (mvsata Marvell 88SX6081 panics on boot)
Date: Fri, 1 Nov 2019 18:44:03 -0000 (UTC)

 prlw1%cam.ac.uk@localhost (Patrick Welche) writes:
 
 > Any idea where the status values in
 >   __wdcwait: timeout (time=1001), status d0 error 0 (mask 0x40 bits 0x40)
 > 
 > are defined?
 
 That's the hex value of the status register. See sys/dev/ata/atareg.h.
 
 0xd0 = WDCS_BSY | WDCS_DRDY | WDCS_DSC;
 
 The timeout happens because the drive never cleared the busy flag,
 the code waits for (mask | WDCS_BSY) == bits.
 
 The names are ancient, in ATA speak WDCS_DSC is the DF (Device Fault) flag
 that says that a command couldn't be completed (in contrast to a command
 that is completed with or without an error). There are special modes
 where the DF flag and others get repurposed to signal other conditions,
 but that's not relevant here.
 
 -- 
 -- 
                                 Michael van Elst
 Internet: mlelstv%serpens.de@localhost
                                 "A potential Snark may lurk in every tree."