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PowerMac serial console confusion

From: Aaro Koskinen
Subject: PowerMac serial console confusion
Date: Sat, 9 Nov 2013 19:04:51 +0200
User-agent: Mutt/1.5.21 (2010-09-15)


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


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?


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