U-boot relocation address for OMAP5 EVK board

Kumar Kumar

I am using dra7xx evm board. I have below doubhts while understanding the U-boot source. Can you please help.

1) In include/configs/ti_armv7_common.h file CONFIG_SYS_TEXT_BASE was defined as "0x80800000", how this address is derived. I could see following entries in TRM under memory map,

       Region Name             Start_Address     End_Address       Size      Description
    EMIF1_SDRAM_CS0    0x8000_0000       0xBFFF_FFFF     1 GiB     EMIF1 CS0: Access to DDR
    EMIF2_SDRAM_CS0    0x8000_0000       0xBFFF_FFFF     1 GiB     EMIF2 CS0: Access to DDR

This relocation address was chosen randomly between start and end address of EMIF1_SDRAM_CS0?

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Sorry, but neither OMAP5 nor DRA7X processors are supported on this forum.

0 Kumar Kumar over 9 years ago in reply to Biser Gatchev-XID

Prodigy 180 points

I couldn't able to post under OMAP5 forum, it is readonly - e2e.ti.com/.../885 . Can you please guide the link to move this query.

0 Yordan Kovachev over 9 years ago in reply to Kumar Kumar

TI__Guru**** 161600 points

Hi,

Could you share, which GLSDK are you using?

Best Regards,
Yordan

0 Kumar Kumar over 9 years ago in reply to Yordan Kovachev

Prodigy 180 points

I am using GLSDK 7.0.

0 Yordan Kovachev over 9 years ago in reply to Kumar Kumar

TI__Guru**** 161600 points

Hi,

Have a look at include/configs/ti_armv7_common.h, there are quite detailed comments explaining the loading of u-boot into DDR.

Best Regards,
Yordan

0 Kumar Kumar over 9 years ago in reply to Yordan Kovachev

Prodigy 180 points

First statement of the comment is "Place the image at the start of the ROM defined image space ", can you help to understand the following based on this statement.

Here image means u-boot or MLO, and what exactly meant by ROM defined image space.

0 Yordan Kovachev over 9 years ago in reply to Kumar Kumar

TI__Guru**** 161600 points

Hi,

Image means MLO, then it loads u-boot in the ddr and finally u-boot loads the kernel image.
"what exactly meant by ROM defined image space"
ROM code is the first bootloader, which prepares the processor to read & load the MLO. It is programmed at design time, information about it is present in Initialization chapter in DRA7xx TRM.

Best Regards,
Yordan

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U-boot relocation address for OMAP5 EVK board