[OpenBIOS] Sparc32 boots Linux...

[Greg Watson]

OF support for Linux on PPC works by making a copy of the device tree  
when it first boots. From then on there are no direct calls made to  
OF, only to read values from the copy of the device tree. This will  
only work if the OS does not need to make any direct calls to the  
BIOS (which Linux doesn't). If Solaris needs to make calls then you  
are going to have to implement a mechanism to trap into the BIOS. See  
arch/ppc/kernel/prom.c.

Greg


On May 8, 2006, at 2:03 PM, Blue Swirl wrote:

> The loading error happened because Forth stack was in the middle of  
> the kernel file being loaded. I moved it away.
>
> Now, with an ELF kernel file as -hda:
>
> 2 > boot disk
> [sparc] Booting file 'disk' with parameters '<NULL>'
> Unknown filesystem type
> Loading image...
> segment 0 addr:0x0 file:0x2780e0 mem:0x2a3828 loading...  
> clearing... clearing checksum... ok
> Loaded 2588896 bytes
> entry point is 0x4000
> Jumping to entry point...
> halt, power off
>
> Looking at /tmp/qemu.log we find that Linux mapped itself to  
> 0xf0000000, called a few Openprom functions and because of the bad  
> results decided to halt.
>
> Now we need to implement the Openprom functions for browsing the  
> device tree and others in romvec.c. For example, the sequence Linux  
> uses to find root node properties is something like:
>
> node = nextnode(0); // get handle for "/"
> ok = getprop(node, NULL, &str); // str should be the first  
> property, for example "compatible"
>
> How can I get this kind of handles from C?
>
> It would be nice to get booting by loading boot sectors working so  
> that instead of Linux we can try SILO.
>
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