How to recognize 2G DDR3 on imx6q sabresd?

[jiangshao]

I have a im6q sabresd (2G DDR3, OS is android4.4.2), but from u-boot to look ,

DRAM is only 1GB. How to change to make it recognize 2G DDR3?

I have changed flash_header.S like this:

--- /media/myandroid/work/2g/uboot-imx/board/freescale/mx6q_sabresd/flash_header.S.1g

+++ /media/myandroid/work/2g/uboot-imx/board/freescale/mx6q_sabresd/flash_header .S.2g

@@ -131,9 +131,9 @@

MXC_DCD_ITEM(46, MMDC_P0_BASE_ADDR + 0x02c, 0x000026d2)

MXC_DCD_ITEM(47, MMDC_P0_BASE_ADDR + 0x030, 0x00431023)

-MXC_DCD_ITEM(48, MMDC_P0_BASE_ADDR + 0x040, 0x00000017)

-

-MXC_DCD_ITEM(49, MMDC_P0_BASE_ADDR + 0x000, 0x83190000)

+MXC_DCD_ITEM(48, MMDC_P0_BASE_ADDR + 0x040, 0x00000047)

+

+MXC_DCD_ITEM(49, MMDC_P0_BASE_ADDR + 0x000, 0x841a0000)

MXC_DCD_ITEM(50, MMDC_P0_BASE_ADDR + 0x01c, 0x04008032)

MXC_DCD_ITEM(51, MMDC_P0_BASE_ADDR + 0x01c, 0x00008033)

@@ -250,9 +250,9 @@

MXC_DCD_ITEM(68, MMDC_P0_BASE_ADDR + 0x01c, 0x00008000)

MXC_DCD_ITEM(69, MMDC_P0_BASE_ADDR + 0x02c, 0x000026d2)

MXC_DCD_ITEM(70, MMDC_P0_BASE_ADDR + 0x030, 0x00431023)

-MXC_DCD_ITEM(71, MMDC_P0_BASE_ADDR + 0x040, 0x00000027)

-

-MXC_DCD_ITEM(72, MMDC_P0_BASE_ADDR + 0x000, 0x831A0000)

+MXC_DCD_ITEM(71, MMDC_P0_BASE_ADDR + 0x040, 0x00000047)

+

+MXC_DCD_ITEM(72, MMDC_P0_BASE_ADDR + 0x000, 0x841A0000)

# Initialize 2GB DDR3 - Micron MT41J128M

MXC_DCD_ITEM(73, MMDC_P0_BASE_ADDR + 0x01c, 0x04008032)

@@ -363,9 +363,9 @@

MXC_DCD_ITEM(68, MMDC_P0_BASE_ADDR + 0x01c, 0x00008000)

MXC_DCD_ITEM(69, MMDC_P0_BASE_ADDR + 0x02c, 0x000026D2)

MXC_DCD_ITEM(70, MMDC_P0_BASE_ADDR + 0x030, 0x005A1023)

-MXC_DCD_ITEM(71, MMDC_P0_BASE_ADDR + 0x040, 0x00000027)

-

-MXC_DCD_ITEM(72, MMDC_P0_BASE_ADDR + 0x000, 0x831A0000)

+MXC_DCD_ITEM(71, MMDC_P0_BASE_ADDR + 0x040, 0x00000047)

+

+MXC_DCD_ITEM(72, MMDC_P0_BASE_ADDR + 0x000, 0x841A0000)

MXC_DCD_ITEM(73, MMDC_P0_BASE_ADDR + 0x01c, 0x04088032)

MXC_DCD_ITEM(74, MMDC_P0_BASE_ADDR + 0x01c, 0x00008033)

but does NOT work.

[Yuri]

  According to section 18 (How do I enable 512MB DDR memory in U-Boot?)
of the “Android_Frequently_Asked_Questions.pdf” in Android documentation,
it is needed to modify parameter PHYS_SDRAM_1_SIZE in “mx6q_sabresd.h”

~/myandroid/bootable/bootloader/uboot-imx/include/configs/mx6q_sabresd.h

#define PHYS_SDRAM_1_SIZE (1u * 2048 * 1024 * 1024)

Please refer to the section 18 for more details.

Have a great day,
Yuri

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