[OpenBIOS] [PATCH] drivers/escc.c: Add slot-names property ch-a node under escc
Alyssa Milburn
fuzzie at fuzzie.org
Tue Feb 9 09:24:13 CET 2016
On Mon, Feb 08, 2016 at 10:45:42PM -0500, Programmingkid wrote:
> Mac OS X's AppleSCCSerial kernel extension requires the slot-names property in order to use any serial ports. This patch adds the property.
>
> After this patch is applied, the next thing that stops Mac OS X from using the serial port is something having to do with DMA.
Great!
You can assign addresses for serial DMA and even OS 9 will try poking at the
dbdma controller, so this is just a question of hooking up the qemu side. I
can try doing this later today if it's useful..
Which version of OS X are you using for testing this?
> http://www.opensource.apple.com/source/AppleSCCSerial/AppleSCCSerial-126.4.0/PPCSerialPort.cpp
> In this file the setPortName() function is what does the searching for slot-names.
>
> Index: drivers/escc.c
> ===================================================================
> --- drivers/escc.c (revision 1378)
> +++ drivers/escc.c (working copy)
> @@ -456,6 +456,11 @@
> NEWWORLD(set_property(dnode, "interrupts",
> (char *)&props, 3 * sizeof(cell)));
>
> + /* The four numbers in front of Modem are needed for AppleSCCSerial
> + kernel extension compatibility. */
> + char *names = "0001Modem";
Weird. Is this meant to be \x00\x00\x00\x01Modem? (I see that the OS X code
you linked is just skipping the first four bytes. And it hardcodes the
PowerMac1,1 case I switched to for my own testing, heh..!)
> + NEWWORLD(set_property(dnode, "slot-names", names, strlen(names) + 1));
If so, I guess you have to replace the strlen with a hard-coded length.
(Shouldn't the slot-name only be set to a string for one channel? Maybe it
doesn't matter?)
> +
> device_end();
>
> if (legacy) {
>
- Alyssa
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