boot uboot from ram p3040ds

[pareshchaudhary]

Hi,

I have p3041 development kit. It has preloaded uboot. I want to boot uboot from ram . I am using tftp to copy uboot on specified ram memory and use go command for boot but i am getting unexceptional error.

Here is the my information. My RAM memory range is 0x00000000 - 0x80000000

I have assign memory which comes under ram memory range to CONFIG_SYS_TEXT_BASE = 0x11000000 and CONFIG_RESET_VECTOR_ADDRESS = 0x1108fffc and also stop ddr init logic from uboot.

I am following below sequence for boot from preloaded uboot console.

tftp 0x11000000 uboot.pbl

go 0x1108f000

Here are the attached System.map and u-boot.map for reference. I am taking reference  from linux - loading u-Boot in memory instead of flashing it - Stack Overflow

Anyone facing that kind of problem. What will be the issue. Let me know if any more information required to understand problem.

Original Attachment has been moved to: u-boot.map.zip

Original Attachment has been moved to: System.map.zip

[pareshchaudhary]

Anyboady facing this kind of issue.

@Yiping Wang

[pareshchaudhary]

Hi Pavel,

From above log below is the my findings:

I got error from this "STD_EXCEPTION(0x0e00, InstructionTLBError, UnknownException)" It's defined in Start.s.

[Pavel]

U-boot cannot be configured for starting from RAM. The main problem that u-boot contains code for DDR initialization. If u-boot is started from RAM, this code should be removed.

Look at the following page:

http://www.denx.de/wiki/view/DULG/CanUBootBeConfiguredSuchThatItCanBeStartedInRAM

Have a great day,
Pavel Chubakov

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

[pareshchaudhary]

Hi Pavel,

Thanks for information.

But in uboot i have already disable ddr initialization code.  There is one function in common/board_f.c file which is basically do ddr related initialization.

Still facing crash issue. Can you please conform that my text_base and vector address is correct or not.

Is there anything that i have to do for boot ?

[pareshchaudhary]

Here is the my crash dump.

go 0x1108f000

## Starting application at 0x1108F000 ...

Bad trap at PC: ffffaae8, SR: 0, vector=e00

NIP: FFFFAAE8 XER: 20000000 LR: 7FEF0B6C REGS: 7fdedbe0 TRAP: 0e00 DAR: 00000000

MSR: 00000000 EE: 0 PR: 0 FP: 0 ME: 0 IR/DR: 00

GPR00: 7FF00CA8 7FDEDCD0 7FDEDEE8 00000001 7FE1EDAC 7FE1EDAC FFFFFFFF 7FDEDB9C

GPR08: 00000001 1108F000 00000020 7FDEDCD0 7FF567BC 8284581C 7FF61E3A 7FE1EDA8

GPR16: 7FF61E30 7FF61E2C 7FE060D8 7FE1EDD8 00000000 00000000 00000000 FFFFAAE8

GPR24: 00000000 7FFB0284 00000002 7FE1EDA8 1108F000 00000002 7FF7A1F4 7FE1EDAC

Call backtrace:

7FF00CA8 7FF1D17C 7FEFF67C 7FEFFE2C 7FEFFED8 7FF1BBF0 7FF00844

7FF4D1EC 7FF00C40 7FEF0F50

Exception in kernel pc ffffaae8 signal 0

### ERROR ### Please RESET the board ###

Let me know if any more information required.