Re: Booting original iMac

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

With the video set to 16-bit ("thousands") via MacOS X, machfb text
console works on NetBSD-5.0_STABLE GENERIC.

On Thu, 11 Mar 2010, Michael wrote:

> On Mar 11, 2010, at 3:39 PM, John D. Baker wrote:

> > I described problems booting -current on the iMac (hangs after message
> > about waiting for SCSI devices to settle).  I built and tried 5.0_STABLE,
> > but it has the same problem as -current.
> I seriously doubt it's the SCSI chip, that's just (one of) the last line(s) 
> displayed. At that time the kernel will also probe for USB devices and a 
> bunch of other things, any of which could cause the hang.

machfb clears the screen after attachment, so I can only see the last
few lines before the hang:

[...]
[clearscreen]
wsdisplay0 at machfb0 kbdmux 1: console (default, vt100 emulation)
ohci0 at pci0 dev 20 function 0: Opti 82C861 (rev. 0x10)
ohci0: interrupting at irq 28
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB vevision 1.0
biomask 80003fe netmask 80003fe ttymask 80003fe
scsibus0: waiting 2 seconds for devices to settle...
[hung]

> You don't need any of the devices that attach to adb, only adb itself ( or 
> alternatively, cuda ). The iMac doesn't have any actual ADB hardware, you 
> still need the adb driver to access the real time clock and to reboot the 
> machine. Yes, the driver's name is misleading, it does more than just provide 
> access to ADB.
> In 5.0 - does the kernel probe USB and IDE devices before hanging?
> Also, does anything change if you get rid of adb and use cuda instead?
> ( cuda does what adb does, only with clean separation of the actual ADB 
> support code, a bunch of bug fixes and support for an i2c bus which is needed 
> only on beige G3s so far )

I changed BONDI(-nb5.txt) to disable "adb at obio" and all "foo at adb"
then enabled cuda (and nadb).  It made no observable difference.  It
hangs just as shown above.

Thanks for the help.
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