TDA4VM: We want change the ram size from uboot(device tree)

Pierre Hsieh

Intellectual 875 points

Part Number: TDA4VM

Hi ,

We want change the ram size from 16G to 8G

device tree

k3-j721s2-som-p0.dtsi

memory@80000000 {

device_type = "memory";

/* 16 GB RAM */

reg = <0x00 0x80000000 0x00 0x80000000>,

<0x08 0x80000000 0x03 0x80000000>;

};

How colud we modify the reg to 8G?

or any other file need to modify ?

over 2 years ago

+1 Keerthy J over 2 years ago

TI__Guru*** 140840 points

HI,

There is an FAQ on J721e: https://e2e.ti.com/support/processors/f/791/t/1097117

Please follow along the similar lines on j721s2.

- Keerthy

+1 Pierre Hsieh over 2 years ago in reply to Keerthy J

Intellectual 875 points

I change as follow but still show 16G on uboot
//Modify b/arch/arm/dts/k3-j721s2-som-p0.dtsi

memory@80000000 {

device_type = "memory";

/* 16 GB RAM */

reg = <0x00 0x80000000 0x00 0x80000000>,

# <0x08 0x80000000 0x03 0x80000000>;

<0x08 0x80000000 0x01 0x80000000>;

};

//b/arch/arm/mach-k3/arm64-mmu.c //don't know how to modify for block-size (example is 4g to 1g)

//b/board/ti/j721s2/evm.c //don't know how to modify for block-size (example is 4g to 1g)

//b/configs/j721e_evm_a72_defconfig // we are 2 block of 4g , no need to modify to 1

What should I do next setp or somethings wrong?

0 Pierre Hsieh over 2 years ago in reply to Keerthy J

Intellectual 875 points

I find I missed modify evm.c . Thanks for your help

0 Keerthy J over 2 years ago in reply to Pierre Hsieh

TI__Guru*** 140840 points

Hi Pierre,

Great! For our reference could you please paste the complete code changes diff here?

Closing this one.

- Keerthy

0 Pierre Hsieh over 2 years ago in reply to Keerthy J

Intellectual 875 points

Hi Keerthy:

//b/board/ti/j721s2/evm.c

in't dram_init_banksize(void)

{

/* Bank 0 declares the memory available in the DDR low region */

gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;

gd->bd->bi_dram[0].size = 0x7fffffff; //2g

gd->ram_size = 0x80000000;

#ifdef CONFIG_PHYS_64BIT

/* Bank 1 declares the memory available in the DDR high region */

gd->bd->bi_dram[1].start = CONFIG_SYS_SDRAM_BASE1;

// gd->bd->bi_dram[1].size = 0x37fffffff; // 14g to 6g

gd->bd->bi_dram[1].size = 0x17fffffff; // 14g to 6g

gd->ram_size = 0x400000000;

#endif

return 0;

}

Thanks for your help.

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TDA4VM: We want change the ram size from uboot(device tree)