PowerMac serial console confusion

PowerMac serial console confusion

[Aaro Koskinen]

Hi,

On Apple Xserve G5, the device tree looks like this with Linux v3.12:

	/proc/device-tree/ht@0,f2000000/pci@3/mac-io@7/escc@13000/ch-b@13000
	/proc/device-tree/ht@0,f2000000/pci@3/mac-io@7/escc@13000/ch-a@13020

Linux picks the ch-a as the first serial port:

	[    2.288585] 0.00013020:ch-a: ttyS0 at MMIO 0x80013020 [...]

Also in Open Firmware the primary serial port seems to be ch-a (there
is only one port in the box anyway). However, that won't work in GRUB
and I need to say "serial escc-ch-b --speed=57600" to get the serial
console working.

It would seem that GRUB 2.00 has ch-a and ch-b the other way round:

	add_device (macio_addr[2] + escc_addr[0] + 32, 1);
	add_device (macio_addr[2] + escc_addr[0], 0);

[...]

	add_device (grub_addr_t addr, int channel)

[...]

	port->name = grub_xasprintf ("escc-ch-%c", channel + 'a');

Is this a bug or maybe I have missed something?

A.

Re: PowerMac serial console confusion

[Vladimir 'φ-coder/phcoder' Serbinenko]

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On 09.11.2013 18:04, Aaro Koskinen wrote:
> Hi,
> 
> On Apple Xserve G5, the device tree looks like this with Linux v3.12:
> 
> 	/proc/device-tree/ht@0,f2000000/pci@3/mac-io@7/escc@13000/ch-b@13000
> 	/proc/device-tree/ht@0,f2000000/pci@3/mac-io@7/escc@13000/ch-a@13020
> 
> Linux picks the ch-a as the first serial port:
> 
> 	[    2.288585] 0.00013020:ch-a: ttyS0 at MMIO 0x80013020 [...]
> 
> Also in Open Firmware the primary serial port seems to be ch-a (there
> is only one port in the box anyway). However, that won't work in GRUB
> and I need to say "serial escc-ch-b --speed=57600" to get the serial
> console working.
> 
> It would seem that GRUB 2.00 has ch-a and ch-b the other way round:
> 
> 	add_device (macio_addr[2] + escc_addr[0] + 32, 1);
> 	add_device (macio_addr[2] + escc_addr[0], 0);
> 
> [...]
> 
> 	add_device (grub_addr_t addr, int channel)
> 
> [...]
> 
> 	port->name = grub_xasprintf ("escc-ch-%c", channel + 'a');
> 
> Is this a bug or maybe I have missed something?
> 
It is a bug: I must have exchanged add_device's in order to make order
right but it didn't work since I forgot to change the argument.
Fixed, thanks.
On another note: your message was stuck in spambox, I've seen it only
because I was looking for another message in spambox. Apparently iki.fi
is on some blacklist.
> A.
> 



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