[U-Boot] [PATCH] ppc4xx: amcc: Set CONFIG_SYS_BOOTMAPSZ to 16MB to enable booting of big kernels

[U-Boot] [PATCH] ppc4xx: amcc: Set CONFIG_SYS_BOOTMAPSZ to 16MB to enable booting of big kernels

[Stefan Roese]

This patch changes CONFIG_SYS_BOOTMAPSZ from 8MB to 16MB which is the
initial TLB on 40x PPC's in the Linux kernel. With this change even bigger
Linux kernels (> 8MB) can be booted.

Signed-off-by: Stefan Roese <sr@denx.de>
---
 include/configs/amcc-common.h |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/configs/amcc-common.h b/include/configs/amcc-common.h
index 3b733c0..e82b5ed 100644
--- a/include/configs/amcc-common.h
+++ b/include/configs/amcc-common.h
@@ -137,10 +137,10 @@
 
 /*
  * For booting Linux, the board info and command line data
- * have to be in the first 8 MB of memory, since this is
- * the maximum mapped by the Linux kernel during initialization.
+ * have to be in the first 16 MB of memory, since this is
+ * the maximum mapped by the 40x Linux kernel during initialization.
  */
-#define CONFIG_SYS_BOOTMAPSZ		(8 << 20) /* Initial Memory map for Linux */
+#define CONFIG_SYS_BOOTMAPSZ		(16 << 20) /* Initial Memory map for Linux */
 
 /*
  * Internal Definitions
-- 
1.6.3.4

[U-Boot] [PATCH] ppc4xx: amcc: Set CONFIG_SYS_BOOTMAPSZ to 16MB to enable booting of big kernels

[Peter Tyser]

Hi Stefan,

On Wed, 2009-07-29 at 16:25 +0200, Stefan Roese wrote:
> This patch changes CONFIG_SYS_BOOTMAPSZ from 8MB to 16MB which is the
> initial TLB on 40x PPC's in the Linux kernel. With this change even bigger
> Linux kernels (> 8MB) can be booted.

Might be nice to increase CONFIG_SYS_BOOTM_LEN at the same time.  Or
maybe something along the lines of changing CONFIG_SYS_BOOTM_LEN to be
based on CONFIG_SYS_BOOTMAPSZ in general as (at a glance) it looks like
they should generally be the same value.

Best,
Peter

[U-Boot] [PATCH] ppc4xx: amcc: Set CONFIG_SYS_BOOTMAPSZ to 16MB to enable booting of big kernels

[Stefan Roese]

Hi Peter,

On Wednesday 29 July 2009 16:36:17 Peter Tyser wrote:
> > This patch changes CONFIG_SYS_BOOTMAPSZ from 8MB to 16MB which is the
> > initial TLB on 40x PPC's in the Linux kernel. With this change even
> > bigger Linux kernels (> 8MB) can be booted.
>
> Might be nice to increase CONFIG_SYS_BOOTM_LEN at the same time.  Or
> maybe something along the lines of changing CONFIG_SYS_BOOTM_LEN to be
> based on CONFIG_SYS_BOOTMAPSZ in general as (at a glance) it looks like
> they should generally be the same value.

I never "tuned" CONFIG_SYS_BOOTM_LEN before. But you are right, this should be 
changed as well. I'll wait a short while for further comments on this and send 
an updated patch version then.

Thanks.

Best regards,
Stefan

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