Query regarding ZRELADDR, ZTEXTADDR and zImage.

[JAYESH TANK]

Hope this helps:  http://www.kernelport.org/kernelport/defines.html

Cheers... :)


On Tue, Apr 17, 2012 at 7:10 PM, KARTHIK SEKURU <karthik.sekuru at gmail.com>wrote:

> Hi,
> I'm doing kernel porting to arm926 based FPGA board,very minimal setup
> (uart + timer only)
>
> Below are the details
>
> #define PLAT_PHYS_OFFSET       0x80000000 (with 128 MB SDRAM)
> #define CONFIG_PAGE_OFFSET  0xc0000000
>
>
> Physical memory : 128MB (0x80000000 to 88000000)
>
> ZRELADDR = 0x80008000
> PARAMS_PHYS = 0x80000100
> INITRD_PHYS = 0x80800000
>
> Kernel cmd line : mem=32M console=ttySAC0,115200 root=/dev/ram0
> rootfstype=cramfs init=/linuxrc initrd=0x80800000,8M user_debug=31
>
>
>
>
>
> I am not using u-boot and doing all the required initializations through
> trace32 cmm script.
>
> Through trace32 I am loading the zImage at 0x80008000.After this I am
> getting the following error..
>
>
>
>
>
> *Uncompressing Linux...*
>
> * *
>
> *uncompression error*
>
> * *
>
> * -- System halted*
>
>
>
>
>
> My doubt is …
>
> ZRELADDR in “Makefile.boot” is set to 0x80008000,i.e the start address of
> the “decompressed zImage”..
>
> And through cmm script I am also loading the “compressed zImage” at the
> same location 0x80008000.
>
> Am I mentioning the source address and destination address as same.i.e the
> compressed zImage and decompressed zImage address are same? Is that OK?
>
>
> ZTEXTADDR:
>
>         Start address of decompressor. Is it the address where i should
> load "compressed zImage". ??
>
>
>
> The “compressed zImage” is decompressed via the function
> decompress_kernel();
>
>
>
> Void decompress_kernel()
>
> {
>
> …
>
> …
>
>
>
> putstr("Uncompressing Linux...");
>
>         ret = do_decompress(input_data, input_data_end - input_data,
>
>                             output_data, error);
> …
>
> …
>
> }
>
> I understand that the arguments going to the function do_decompress() .,
> input_data,input_data_end and output_data are related to zImage address.
>
> Please help me in getting clear understanding about these arguments ??
> What does they mean exactly ??
>
>
>
>
>
> Kindly help me in resolving this uncompression error.
>
>
>
> Karthik.
>
>
>
>
>
>
>
>
>
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>
>
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