Re: BootX
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: 2011-02-02 21:40:50
On Wed, 2011-02-02 at 13:36 -0600, kevin diggs wrote:
Hi, FYI: I have narrowed this down to drivers/scsi/mesh.c (the root disk controller for the PowerMac 8600). I have compiled everything else for 2.6.36 with 4.3.5, including modules. With a 4.1.2 compiled mesh.c the beast boots. I am using it to post this follow up.
That's interesting... That driver is really nasty, we probably have a bug in it that's exposed by optimizations done by more recent compilers but it's not going to be trivial to figure out I'm afraid. I at least have very dim memories of mesh and how it operates... One thing to be careful of with Mesh is that the DMA engine, while supposedly cache coherent, has shown in the past to have issues when DMA'ing to unaligned memory locations. This shouldn't be a problem with normal block transfers but we may have to be careful with things like inquiry, mode pages, sense requests etc... Ben.
kevinquoted
On Sat, Jan 22, 2011 at 12:24 PM, kevin diggs [off-list ref] wrote:quoted
Hi, If I enable SMP then I can build a 2.6.28 kernel with gcc 4.3.5 that WILL boot on the PowerMac8600 (single 750GX). The previously mentioned G4 that runs is a dual cpu beast and thus also runs SMP._______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev