kernel-ark/arch/arm
Lennert Buytenhek 53e173f62c [PATCH] ARM: 2660/2: fix ixdp2800 boot and pci init
Patch from Lennert Buytenhek

The IXDP2800 is an evalution platform for the IXP2800 processor that
has two IXP2800s connected to the same PCI bus.  This is problematic
as both CPUs will try to configure the PCI bus as they boot linux.
Contrary to on the other IXP2000 platforms, the boot loader on the
IXDP2800 doesn't configure the PCI bus properly, so we do want the
linux instance on one of the CPUs to do that.
Making one of the CPUs ignore the PCI bus (and thus act like a pure
PCI slave device) is not an option because there is a 82559 NIC on
the PCI bus for each of the CPUs.
The chosen solution is to have the master CPU configure the PCI bus
while the slave is kept in a quiescent state, and then to have the
slave CPU scan the PCI bus (without assigning resources) while the
master is kept in a quiescent state.  After this ritual, the master
deletes the slave NIC from its PCI device list, the slave deletes
the master NIC from its device list, and (almost) all is well.
There's still one little problem: each of the CPUs has a 1G SDRAM
BAR, but the IXP2000 only has 512M of outbound PCI memory window.
We solve this by hand-assigning the master and slave SDRAM BARs to
a location outside each of the IXP's outbound PCI windows, and by
having the rest of the BARs autoconfigured in the outbound PCI
windows, in the range [e0000000..ffffffff], so that there is a 1:1
pci:phys mapping between them.
Even with this patch, a number of issues still remain -- just imagine
what happens if one of the CPUs is rebooted, by watchdog or by hand,
but the other one isn't.  But those issues are not easily fixable
given the strange PCI layout of this board and the behavior of the
boot loader shipped with the platform.

Signed-off-by: Lennert Buytenhek
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2005-04-29 22:13:57 +01:00
..
boot Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
common Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
configs [PATCH] ARM: 2660/2: fix ixdp2800 boot and pci init 2005-04-29 22:13:57 +01:00
kernel [PATCH] ARM: 2651/3: kernel helpers for NPTL support 2005-04-29 22:08:33 +01:00
lib [PATCH] ARM: Add missing new file for bitops patch 2005-04-18 22:50:01 +01:00
mach-clps711x Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-clps7500 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-ebsa110 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-epxa10db Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-footbridge [PATCH] ARM: footbridge rtc init 2005-04-17 15:36:55 +01:00
mach-h720x Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-imx Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-integrator Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-iop3xx Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-ixp4xx [PATCH] arm: fix help text for ixdp465 2005-04-16 15:23:56 -07:00
mach-ixp2000 [PATCH] ARM: 2660/2: fix ixdp2800 boot and pci init 2005-04-29 22:13:57 +01:00
mach-l7200 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-lh7a40x Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-omap Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-pxa [PATCH] ARM: 2650/1: PXA27x sleep - workaround Errata 39 & 50 (Patch 2667) 2005-04-25 23:38:55 +01:00
mach-rpc Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-s3c2410 Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-sa1100 [PATCH] ARM: h3600_irda_set_speed arguments 2005-04-17 15:40:46 +01:00
mach-shark Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mach-versatile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
mm [PATCH] ARM: 2656/1: Access permission bits are wrong for kernel XIP sections on ARMv6 2005-04-29 22:08:35 +01:00
nwfpe Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
oprofile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
tools Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
vfp Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Kconfig Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Kconfig.debug Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
Makefile Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00