AcoSail/kernel_optimize_test
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microblaze: Support systems without lmb bram

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When the system has no lmb bram, main memory should be start from
zero because of microblaze vectors.

DTS fragment could look like:
	DDR2_SDRAM: memory@0 {
		device_type = "memory";
		reg = < 0x0 0x10000000 >;
	} ;

Then you have to setup CONFIG_KERNEL_BASE_ADDR=0 which caused
that kernel physical start address will be zero. On reset vector place
will be jump to 0x100 and on 0x100 starts kernel text.

You have to solve how to load the kernel before cpu starts.
Tested with XMD.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2010-03-15 08:48:27 +01:00
parent 89ae9753ae
commit ee68f1745e
1 changed files with 6 additions and 0 deletions
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6
arch/microblaze/kernel/head.S
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@ -51,6 +51,12 @@ swapper_pg_dir:
.text
ENTRY(_start)
#if CONFIG_KERNEL_BASE_ADDR == 0
brai TOPHYS(real_start)
.org 0x100
real_start:
#endif
mfs r1, rmsr
andi r1, r1, ~2
mts rmsr, r1