[ECOS] Re: load address

[ECOS] Re: load address

[YH]

Hello,

I am going to run ARM with kernel 2.6, 32M DRAM and 16M Flash (Intel 
J3). Could you please help me the following questions:

Redboot> load -v -r -b 0xA00000 ramdisk.gz
Redboot> load -v -r -b 0x80000 zImage
Redboot> exec -r 0xA00000 -c "console=ttyAM root=/dev/ram"

1. I guess the address is the DRAM entry address. If the ramdisk.gz = 4M 
and the decompressed ramdisk = 12M, and zImage = 800K, I guess that the 
ramdisk will be allocated in DRAM between 0xA00000 - 0x1600000 and the 
zImage will be allocated in DRAM between 0x80000 - 0x148000. I guess 
those address sections of ramdisk and zImage are occupied during 
operation time, is it correct?

2. Can the DRAM loading addresses be selected anywhere, or it can only 
be selected in particular segments?

3. Do we need to allocate the memory (stack and heaps), or the kernel 
will use the rest of the available DRAM?

Thank you.

Jim





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Re: [ECOS] Re: load address

[Gary Thomas]

YH wrote:
> Hello,
> 
> I am going to run ARM with kernel 2.6, 32M DRAM and 16M Flash (Intel 
> J3). Could you please help me the following questions:
> 
> Redboot> load -v -r -b 0xA00000 ramdisk.gz
> Redboot> load -v -r -b 0x80000 zImage
> Redboot> exec -r 0xA00000 -c "console=ttyAM root=/dev/ram"
> 
> 1. I guess the address is the DRAM entry address. If the ramdisk.gz = 4M 
> and the decompressed ramdisk = 12M, and zImage = 800K, I guess that the 
> ramdisk will be allocated in DRAM between 0xA00000 - 0x1600000 and the 
> zImage will be allocated in DRAM between 0x80000 - 0x148000. I guess 
> those address sections of ramdisk and zImage are occupied during 
> operation time, is it correct?
> 
> 2. Can the DRAM loading addresses be selected anywhere, or it can only 
> be selected in particular segments?
> 
> 3. Do we need to allocate the memory (stack and heaps), or the kernel 
> will use the rest of the available DRAM?
> 

You should ask these questions of the ARM Linux folks.

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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