Kernel not booting when supplying boot parameter mem

Kernel not booting when supplying boot parameter mem

[Arshad, Farrukh]

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Greetings All,

I have a basic question. I have 512 MB memory. I want my kernel to use only last 128 MB of memory starting from address 0x10000000. I have configured the kernel CONFIG_PHYSICAL_START=0x10000000 and in kernel boot parameter I have set mem=128M. In this scenario my kernel is not booting and it just stuck after uncompressing it. If I do not provide mem=128M boot parameter my kernel boots fine, but in that case I can not restrict kernel to use only 128M memory. Why supplying mem=128M causing kernel to fail.

Best Regards

Farrukh Arshad
Sr. Software Development Engineer
Mentor Graphics Pakistan
Ph:   +92 - 423 - 609 - 92 - 09
Cell: +92 - 303 - 444 - 77 - 05


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Re: Kernel not booting when supplying boot parameter mem

[tiejun.chen]

Arshad, Farrukh wrote:
> Greetings All,
> 
> I have a basic question. I have 512 MB memory. I want my kernel to use only last 128 MB of memory starting from address 0x10000000. I have configured the kernel CONFIG_PHYSICAL_START=0x10000000 and in kernel boot parameter I have set mem=128M. In this scenario my kernel is not booting and it just stuck after uncompressing it. If I do not provide mem=128M boot parameter my kernel boots fine, but in that case I can not restrict kernel to use only 128M memory. Why supplying mem=128M causing kernel to fail.
> 

Any kernel option else is configured, such as CONFIG_KERNEL_START and
CONFIG_RELOCATABLE?

Or any u-boot argument is reconfigured, such as 'bootm_low', 'bootm_mapsize' and
'bootm_size'.

Tiejun

RE: Kernel not booting when supplying boot parameter mem

[Arshad, Farrukh]

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Re: Kernel not booting when supplying boot parameter mem

[tiejun.chen]

Arshad, Farrukh wrote:
> Hi Tiejun,
> 
> Thanks for your response. Yes, I am running two kernels one on each core in SAMP configuration on P1022RDK board. Given is my memory partitioning. Core 0 is loading fine but Core 1 is not loading. CONFIG_RELOCATABLE is not set.
> 
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> Core                      	| Base Address  	|    Size                 			| Uboot parameters					| Kernel Configuration									|
> -----------------------------|---------------------------|-------------------------------------|------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------|
> Core 0 (MEL RT Kernel) 	| 0x0000,0000   		| 0x1000,0000 - 256 (MB)   	|bootm_low = 0x0000,0000, bootm_size = 0x1000,0000	| CONFIG_PHYSICAL_START = 0x0000,0000, CONFIG_KERNEL_START = 0xC000,0000	|
> Core 1 (LTIB Kernel)      	|0x1000,0000    		| 0x0800,0000 - 128 (MB)   	|bootm_low = 0x1000,0000, bootm_size = 0x0800,0000	| CONFIG_PHYSICAL_START = 0x1000,0000, CONFIG_KERNEL_START = 0xC000,0000	|
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> 

Please check if the following commit is already in your kernel:
------
    powerpc: Fix memory limits when starting at a non-zero address

    memblock_enforce_memory_limit() takes the desired maximum quantity of memory
    to end up with, not an address above which memory will not be used.

Tiejun

RE: Kernel not booting when supplying boot parameter mem

[Arshad, Farrukh]

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