Date: Fri, 28 Sep 2007 12:17:20 +0200 From: Marius Nuennerich <marius.nuennerich@gmx.de> To: freebsd-arm@freebsd.org Subject: FreeBSD and qemu-neo1973 (was: Re: Comment bug in locore.S?) Message-ID: <20070928121720.22823a58@sol.hackerzberg.local> In-Reply-To: <20070928102332.GA23400@ci0.org> References: <20070928011740.01026dcd@sol.hackerzberg.local> <200709272351.l8RNp0pn066924@casselton.net> <20070928113044.4a2dcdac@sol.hackerzberg.local> <20070928102332.GA23400@ci0.org>
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On Fri, 28 Sep 2007 12:23:32 +0200 Olivier Houchard <mlfbsd@ci0.org> wrote: > On Fri, Sep 28, 2007 at 11:30:44AM +0200, Marius Nuennerich wrote: > > On Thu, 27 Sep 2007 18:51:00 -0500 (CDT) > > Mark Tinguely <tinguely@casselton.net> wrote: > > > > > > > > How about saving the jump address in another register also before the jump: > > > > > > ldr r10, .Lvirt_done > > > ldr pc, .Lvirt_done > > > > I tried this but used r9, anyway the register isn't used otherwise and > > it's contents is R09=c00002a4 after qemu crashes. Is it possible that > > this would be the right address if the kernel would start at 0x30000000 > > and not on 0x30008000 physical address? > > Ah good point. KERNVIRTADDR should be 0xc0008000, not 0xc0000000. > As we're mapping it with sections, we don't have enough granularity to map it > to 0xc0000000. OK, I changed KERNVIRTADDR in the kernel config. qemu still crashes with qemu: fatal: Trying to execute code outside RAM or ROM at 0xc00082ac which should be mapped. But now it doesn't print an A as the last letter over serial line, it's an f. What I don't understand is the the jump to 0xc00082a4 seems to be OK now but a few instructions later it goes boom. Maybe this is the strb instruction for printing chars. Could it be that this won't work after jumping to 0xc... ? Why does the printing of f still work before the ldr? Is there a description available what KERNVIRTADDR, KERNPHYSADDR, PHYSADDR, KERNBASE, et al. mean?
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