* [PATCH] powerpc/40x: Add support for PPC40x boards with > 512MB SDRAM
@ 2010-02-10 13:54 Stefan Roese
2010-02-11 2:39 ` Benjamin Herrenschmidt
0 siblings, 1 reply; 2+ messages in thread
From: Stefan Roese @ 2010-02-10 13:54 UTC (permalink / raw)
To: linuxppc-dev
This patch adds support for boards with more that 512MByte RAM. Currently
only 512MB of memory are enabled in the DCCR/ICCR real-mode cache
control registers. This patch now enables caching in real-mode for
2GByte.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Josh Boyer <jwboyer@linux.vnet.ibm.com>
---
arch/powerpc/mm/40x_mmu.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/mm/40x_mmu.c b/arch/powerpc/mm/40x_mmu.c
index 08dfa8e..65abfcf 100644
--- a/arch/powerpc/mm/40x_mmu.c
+++ b/arch/powerpc/mm/40x_mmu.c
@@ -84,8 +84,8 @@ void __init MMU_init_hw(void)
* vectors and the kernel live in real-mode.
*/
- mtspr(SPRN_DCCR, 0xF0000000); /* 512 MB of data space at 0x0. */
- mtspr(SPRN_ICCR, 0xF0000000); /* 512 MB of instr. space at 0x0. */
+ mtspr(SPRN_DCCR, 0xFFFF0000); /* 2GByte of data space at 0x0. */
+ mtspr(SPRN_ICCR, 0xFFFF0000); /* 2GByte of instr. space at 0x0. */
}
#define LARGE_PAGE_SIZE_16M (1<<24)
--
1.6.6.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] powerpc/40x: Add support for PPC40x boards with > 512MB SDRAM
2010-02-10 13:54 [PATCH] powerpc/40x: Add support for PPC40x boards with > 512MB SDRAM Stefan Roese
@ 2010-02-11 2:39 ` Benjamin Herrenschmidt
0 siblings, 0 replies; 2+ messages in thread
From: Benjamin Herrenschmidt @ 2010-02-11 2:39 UTC (permalink / raw)
To: Stefan Roese; +Cc: linuxppc-dev
On Wed, 2010-02-10 at 14:54 +0100, Stefan Roese wrote:
> This patch adds support for boards with more that 512MByte RAM. Currently
> only 512MB of memory are enabled in the DCCR/ICCR real-mode cache
> control registers. This patch now enables caching in real-mode for
> 2GByte.
Should we make that conditional to how much memory is populated ? Or it
doesn't matter ? I suppose we don't do IO accesses in real mode anyways
so no big deal...
Cheers,
Ben.
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Josh Boyer <jwboyer@linux.vnet.ibm.com>
> ---
> arch/powerpc/mm/40x_mmu.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/mm/40x_mmu.c b/arch/powerpc/mm/40x_mmu.c
> index 08dfa8e..65abfcf 100644
> --- a/arch/powerpc/mm/40x_mmu.c
> +++ b/arch/powerpc/mm/40x_mmu.c
> @@ -84,8 +84,8 @@ void __init MMU_init_hw(void)
> * vectors and the kernel live in real-mode.
> */
>
> - mtspr(SPRN_DCCR, 0xF0000000); /* 512 MB of data space at 0x0. */
> - mtspr(SPRN_ICCR, 0xF0000000); /* 512 MB of instr. space at 0x0. */
> + mtspr(SPRN_DCCR, 0xFFFF0000); /* 2GByte of data space at 0x0. */
> + mtspr(SPRN_ICCR, 0xFFFF0000); /* 2GByte of instr. space at 0x0. */
> }
>
> #define LARGE_PAGE_SIZE_16M (1<<24)
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2010-02-10 13:54 [PATCH] powerpc/40x: Add support for PPC40x boards with > 512MB SDRAM Stefan Roese
2010-02-11 2:39 ` Benjamin Herrenschmidt
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