On Sunday 19 December 2010 09:34:24 Alexander Graf wrote: > On 19.12.2010, at 16:04, Andreas Färber wrote: > > Am 19.12.2010 um 10:54 schrieb Alexander Graf: > >> On 14.12.2010, at 01:49, Andreas Färber wrote: > >>> Hello, > >>> > >>> Based on an earlier attempt of mine to make OpenBIOS work with -M prep, > >>> with kind support from Hervé Poussineau here's an initial stab at > >>> fixing the long-broken PReP emulation and preparing migration from > >>> abandoned OpenHack'Ware to OpenBIOS as default FOSS firmware. > >>> > >>> In particular a number of hw_error()s are resolved, so that the BIOS > >>> can be entered at all. It is not yet working in terms of serial and > >>> VGA support etc. > >>> > >>> This series is also available from: > >>> > >>> git://repo.or.cz/qemu/afaerber.git prep-queue > >>> > >>> Some more work-in-progress for the curious is on my prep branch [2]. > >>> The corresponding work-in-progress OpenBIOS changes are at [3]. > >>> > >>> Unfortunately the prep machine is lacking documentation what exactly it > >>> tries to emulate. The plan thus is to merge emulation of a second, real > >>> IBM 40p machine based on Hervé's work at [1], for use with original > >>> binary firmware. > >>> > >>> Also upcoming are new ppc_chrp machines, forked from ppc_newworld, > >>> emulating the 970-based IBM JS20 (using Apple U3) [4] and possibly the > >>> POWER5-based IntelliStation 285. These depend on the ongoing ppc64 port > >>> of OpenBIOS to be completed though. This relates to PReP in that the > >>> machine IDs will need to be coordinated. > >> > >> Does this series actually make anything work, or is it just a first step > >> set to get your development rolling? IOW, would users benefit from > >> having the patches upstream yet? > > > > As indicated above, it lets you enter a BIOS, which is a user-visible > > improvement. User-supplied binary firmware works with 1 + 3-4, ELF > > firmware with 1-4. Patch 3 depends on review comments. Patch 4 was just > > an FYI for testing the preceding patches and still needs investigation. > > > > For OpenBIOS to work, we need fw_cfg in ppc_prep.c and, independently, > > patches to OpenBIOS. Unless of course we want to use another firmware > > like OFW from the start. The main interest in PReP nowadays will be > > proprietary firmware anyway. I thought Rob (cc'ed) had PReP Linux kernel > > patches for QEMU at some point but I couldn't locate them in the > > Aboriginal Linux tree. > > I'm not sure on the copyright problems we might run into when delivering > binary firmware. So we certainly do need some open source firmware solution > for prep to at least have Linux running. For other guests, I don't see a > reason why users shouldn't try to fetch a real firmware blob separately :).
Milton Miller wrote the ppc_bin in the last message from scratch, and made it available to me under GPLv2. The tarball is the source (which includes a snapshot of dtc, which these days you can suck out of the linux kernel) and the .bin file is the output. I used my own powerpc toolchain (built by the build scripts in the same source tree) to compile it. Rob -- GPLv3: as worthy a successor as The Phantom Menace, as timely as Duke Nukem Forever, and as welcome as New Coke.
