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Re: kern/55540 (aceride Fails To Downgrade Transfer Mode)

The following reply was made to PR kern/55540; it has been noted by GNATS.

From: Kyra Sable <>
To: Martin Husemann <>
Subject: Re: kern/55540 (aceride Fails To Downgrade Transfer Mode)
Date: Sun, 9 Aug 2020 17:50:40 -0400

 On 2020-08-09 01:43, Martin Husemann wrote:
 > On Sat, Aug 08, 2020 at 11:20:14PM -0400, Kyra Sable wrote:
 >> Scarcely "not relevant any more" given NetBSD's intended target audience.
 > Thanks for hunting this done, but I think you misunderstood the commit log
 > message. We certainly still care for this devices still.
 Ah okay, my bad. There seems to be a disturbing trend of rotting support 
 for sparc64 (and especially sparc). I thought this was yet another 
 example of that.
 > This might be a driver bug, or a quirk in combination with certain ATA disks
 > and aceride. We need to dig deeper and avoid the original HBA error, or
 > recognize the issue and adjust capabilities, so we end up with a working
 > setup w/o the error -> degration path.
 AFAIK this is a known issue specific to ATAPI devices (an LG CD-ROM 
 here) and this chip. I've never had an issue with hard drives. Here's 
 the Linux approach (on the very same hardware):
 aceride0 at pci0 dev 13 function 0: Acer Labs M5229 UDMA IDE Controller 
 (rev. 0xc3)
 ata2.00: WARNING: ATAPI DMA disabled for reliability issues.  It can be 
 ata2.00: WARNING: via pata_ali.atapi_dma modparam or corresponding sysfs 
 scsi 1:0:0:0: CD-ROM            HL-DT-ST CD-RW GCE-8525B  1.05 PQ: 0 ANSI: 5
 sr 1:0:0:0: [sr0] scsi3-mmc drive: 40x/52x writer cd/rw xa/form2 cdda tray
 cdrom: Uniform CD-ROM driver Revision: 3.20
 sr 1:0:0:0: Attached scsi CD-ROM sr0

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