On Wed, Jul 13, 2011 at 12:28:36AM -0500, Kumar Gala wrote: > >On Jul 12, 2011, at 1:44 AM, Suzuki K. Poulose wrote: > >> Changes from V1: Uses a tmp mapping in the other address space to setup >> the 1:1 mapping (suggested by Sebastian Andrzej Siewior). >> >> Note: Should we do the same for kernel entry code for PPC44x ? >> >> This patch adds kexec support for PPC440 based chipsets.This work is based >> on the KEXEC patches for FSL BookE. >> >> The FSL BookE patch and the code flow could be found at the link below: >> >> http://patchwork.ozlabs.org/patch/49359/ >> >> Steps: >> >> 1) Invalidate all the TLB entries except the one this code is run from >> 2) Create a tmp mapping for our code in the other address space and jump to it >> 3) Invalidate the entry we used >> 4) Create a 1:1 mapping for 0-2GiB in blocks of 256M >> 5) Jump to the new 1:1 mapping and invalidate the tmp mapping >> >> I have tested this patches on Ebony, Sequoia boards and Virtex on QEMU. >> It would be great if somebody could test this on the other boards. >> >> Signed-off-by: Suzuki Poulose <suzuki at in.ibm.com> >> Cc: Sebastian Andrzej Siewior <bigeasy at linutronix.de> >> --- >> >> arch/powerpc/Kconfig | 2 >> arch/powerpc/include/asm/kexec.h | 2 >> arch/powerpc/kernel/misc_32.S | 170 ++++++++++++++++++++++++++++++++++++++ >> 3 files changed, 172 insertions(+), 2 deletions(-) >> >> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig >> index 423145a6..d04fae0 100644 >> --- a/arch/powerpc/Kconfig >> +++ b/arch/powerpc/Kconfig >> @@ -349,7 +349,7 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE >> >> config KEXEC >> bool "kexec system call (EXPERIMENTAL)" >> - depends on (PPC_BOOK3S || FSL_BOOKE) && EXPERIMENTAL >> + depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP && !47x)) && EXPERIMENTAL > >Is there something special about 47x that its not supported? It's a different MMU type (again), that is similar to 44x but not exact. We can't run a single kernel image on both yet, for example. Also, they aren't widely available so testing on them is difficult. josh
