On 2.6 kernel, about DISCONTIGMEM issue
- From: henry.hooter@xxxxxxxxx
- Date: Sat, 21 Feb 2009 12:02:47 -0800 (PST)
2.6 kernel DISCONTIGMEM issue
There is a trouble wanted to ask for help，in linux 2.6，
On ARM9 board, the physical memory DDR-SDRAM have four banks, it's
total 256MB，decode of hw as follow....
DDR2-SDRAM Memory 1 0x3C00_0000 0x3FFF_FFFF - 64MB
DDR2-SDRAM Memory 2 0x3400_0000 0x37FF_FFFF - 64MB
DDR2-SDRAM Memory 3 0xC000_0000 0xC3FF_FFFF - 64MB
DDR2-SDRAM Memory 4 0xC400_0000 0xC7FF_FFFF - 64MB
Set to flat memory，it can be choose each bank1~4，but limited to 64MB，
now I want to set all memory for OS or AP，except HW usage to buffer，
will left...
DDR2-SDRAM Memory 1 0x3E20_0000 0x3FFF_FFFF - 30MB
DDR2-SDRAM Memory 2 0x35A0_0000 0x37FF_FFFF - 38MB
DDR2-SDRAM Memory 3 0xC200_0000 0xC3FF_FFFF - 32MB
DDR2-SDRAM Memory 4 0xC400_0000 0xC5FF_FFFF - 32MB
On HW requirement, it should start OS from 4th bank (C400_0000), then
bank 4->3->1->2，I will get 132MBmemory for Linux kernel，I have been
search about KERNEL ~kernel_home/include/asm-arm/memory.h shown method
of DISCONTIGMEM to process the issue，but follow by others example on
kernel，by different decode，but still sight to continues，like
kernel_home\include\asm-arm\arch-aaec2000 as follow：
#ifdef CONFIG_DISCONTIGMEM
/*
* The nodes are the followings:
*
* node 0: 0xf000.0000 - 0xf3ff.ffff
* node 1: 0xf400.0000 - 0xf7ff.ffff
* node 2: 0xf800.0000 - 0xfbff.ffff
* node 3: 0xfc00.0000 - 0xffff.ffff
*/
It's large different to my problem，I don't know how to solve this
problem，
And ask for help，In linux kernel, How can I port the needed code for
discounting memory usage on physical memory that can set to use for
Linuxsystem & AP, thanks a lots!!
.
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