DYNAMIC_MEMSTART(old RELOCATABLE) was restricted only to PPC_47x variants
of 44x. This patch enables DYNAMIC_MEMSTART for 440x based chipsets.
Signed-off-by: Suzuki K. Poulose <suz...@in.ibm.com>
Cc: Josh Boyer <jwbo...@gmail.com>
Cc: Kumar Gala <ga...@kernel.crashing.org>
Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Cc: linux ppc dev <linuxppc-dev@lists.ozlabs.org>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/kernel/head_44x.S | 12 ++++++++++++
2 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 8d4f789..076782d 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -844,7 +844,7 @@ config LOWMEM_CAM_NUM
config DYNAMIC_MEMSTART
bool "Enable page aligned dynamic load address for kernel
(EXPERIMENTAL)"
- depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE ||
PPC_47x)
+ depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE ||
44x)
help
This option enables the kernel to be loaded at any page aligned
physical address. The kernel creates a mapping from KERNELBASE to
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index d5f787d..62a4cd5 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -802,12 +802,24 @@ skpinv: addi r4,r4,1 /*
Increment */
/*
* Configure and load pinned entry into TLB slot 63.
*/
+#ifdef CONFIG_DYNAMIC_MEMSTART
+
+ /* Read the XLAT entry for our current mapping */
+ tlbre r25,r23,PPC44x_TLB_XLAT
+
+ lis r3,KERNELBASE@h
+ ori r3,r3,KERNELBASE@l
+
+ /* Use our current RPN entry */
+ mr r4,r25
+#else
lis r3,PAGE_OFFSET@h
ori r3,r3,PAGE_OFFSET@l
/* Kernel is at the base of RAM */
li r4, 0 /* Load the kernel physical address */
+#endif
/* Load the kernel PID = 0 */
li r0,0
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