boot problem after changing uboot mem_reserve_head

Hi Ahmet,

Please refer to the following TI wiki for changing the default kernel uImage address.

http://processors.wiki.ti.com/index.php/MCSDK_UG_Chapter_Exploring#How_to_run_Linux_kernel_from_a_different_physical_address_than_default_.280x80000000.29.C2.A0.3F

http://processors.wiki.ti.com/index.php/MCSDK_UG_Chapter_Exploring#Reserve_DDR_memory

Thank you for your quick response. 

But as I mentioned in my post I tried the suggested patch in the MCDSK user guide  for changing DDR base address to 0x90000000 instead of 0xA0000000. But it did not work. İf I change uboot  CONFIG_SYS_SDRAM_BASE to 0x90000000 u-boot hangs during dedection of RAM. 

 It is not valid patch for my case but I do not know why ? 

Are you working on EVM or custom board? Please ensure to update the CONFIG_MAX_RAM_BANK_SIZE as well for the correct value.

In the provided example, the size of the DDR bank is 2GB initially and the patch reserves first 512 MB (0x80000000-9FFFFFFF) and next 1 GB for u-boot.

Please let me know whether the patch works or not without modifying it.

Thank you.

I am working on XTCIEVMK2x Rev 2 k2hk board.  For my case I want to reserve first 256MB of RAM starting from 0x80000000. For this I want to modify uImage enry point. Also my board has 2GB RAM. 

For uboot I modified the SDRAM_BASE and BANK_SIZE like this,

#define CONFIG_SYS_SDRAM_BASE		0x90000000

#define CONFIG_MAX_RAM_BANK_SIZE	((1024 * 1024) * 1024).

Without modifying uboot if I use mem_reserve_head env variable to reserve first 256 MB of ram kernel does not boot. Because default load address and entry point of default uImage is 0x80008000. 
But also if I modify uboot with these uboot hangs.

Also  I tried (with default  kernel and u-boot configuration) to change device tree memory node for example like this

memory {
	reg = <0x00000000 0x90000000 0x00000000 0x10000000>;
};

To say kernel use the ram starting from  0x90000000 and size is 256MB. But when kernel boot up it says avaible RAM approximately 2G. why uboot changes the memory configuration on DTB file ? I can only manipulate the memory reservations with uboot mem_reserve and mem_reserve_head parameters also with kernel MEM= ?? command line arguments.   

Thank you,

Yes I changed the env variables.but it did not work.