Re: BMC junk devices

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

On Wed, Aug 12, 2026 at 01:14:58PM +0000, Emmanuel Dreyfus wrote:
> They are detected, then disconnected, then detected again... Do we
> have a simple way of disabling them? 
> 
> userconf does not help, because they are not there a boot time. 

The machine also often freeze at boot when attaching ipmi_acpi0,
and if it boots it complains about ipmi errors:  ipmi0: autoconfiguration
error:  error code: 0

I tried userconf disable ipmi_acpi* but the statement seems ignored
when loading a Xen dom0. Do we have an example of appropriate syntax
for using userconf in boot.cfg with xen?

I finaly built a custom kernel to workaround userconf:
include         "arch/amd64/conf/XEN3_DOM0"

no uhub*           at uhub?
no ugen*           at uhub?
no ipmi_acpi*      at acpi?

No freeze at boot, no ipmi errors, but this broken BMC still bugs
me a bit, the kernel displaying this every few seconds:
Aspeed (0x1d6b) USB Virtual Hub (0x0107), class 9/0, rev 2.00/1.00, addr 3, uhub1 port 4 not configured

I could just try to blacklist it in USB scanning, but such a change 
ought to be local: this stuff may work fine on other machines.

-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost