Date: Fri, 02 Jun 2006 21:46:19 +0200 From: Rafal Jaworowski <raj@semihalf.com> To: Aditya Godbole <aag.lists@gmail.com> Cc: Peter Grehan <grehan@freebsd.org>, freebsd-ppc@freebsd.org Subject: Re: Booting from u-boot Message-ID: <4480958B.2060205@semihalf.com> In-Reply-To: <4b178a13.c18b236b.81b8e00@dommail.onthenet.com.au>
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Peter Grehan wrote: >> I was thinking of writing an openfirmware emulator code >> that will map the information given by u-boot to the format >> expected by the freebsd openfirmware code. In other words, >> implement the 'openfirmware' function in the kernel itself >> and use it. > > That is an interesting approach, though you may end up doing > just as much work in writing the emulation code as if you > removed the dependency on openfirmware in the kernel. > I would agree with what Peter says - and it's not particularly difficult to divorce the kernel from OF and bind it to something else instead. I did this sort of thing while doing a FreeBSD port to an MCP750 CompactPCI board which had Motorola's PPCBug firmware. One of the things you could also consider would be not booting the kernel directly off U-Boot but getting the 3rd stage loader(8) run first, so you could pass the kernel env in the native way (that's what I did on the PPCBug) and generally have the kernel in the form it normally is produced with buildkernel (and not prepend it with U-Boot header etc.). Having said that I'd be actually very interested in your making the FreeBSD kernel compliant with U-Boot and be able to run it directly. >> Has anyone done this before? > > Not to my knowledge. > We ported U-Boot to many h/w platforms and know it pretty well, also brought FreeBSD to this compactPCI board, so might help you somehow. What device are you using? Rafalhome | help
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