RE: [microblaze-uclinux] kernel image in SDRAM but not booting

["Jari IDXNET" <jari77@xxxxxxxxxx>]

I remember that the good way to know if it can "jump to the kernel start up"
is:
1. load your kernel image,
2. then use the xmd to read some words at the kernel image address to check
it is correct or not
(comparing to the kernel image file).

Try and post your results, and I hope it can solve your problem.
Jari


-----Original Message-----
From: owner-microblaze-uclinux@itee.uq.edu.au
[mailto:owner-microblaze-uclinux@itee.uq.edu.au]On Behalf Of anand_12
Sent: Thursday, July 22, 2004 9:32 PM
To: uclinux-dev@uclinux.org
Subject: [microblaze-uclinux] kernel image in SDRAM but not booting









Hi all

 I am trying to boot uClinux(using MicroBlaze..on a memec spartan 2e board)
after moving the image from FLASH to SDRAM.I am using the 'trivial'
bootloader provided in the mbvanilla_net package available at john's
website...

 The image is getting copied correctly from FLASH to RAM..I printed the
first few bytes of SDRAM using the ddr_start pointer(and xil_printf
ofcourse)..and cross checked these few bytes with those on the FLASH
chip(using the TCL script xmdflash.tcl/flashdow.tcl)..they were exactly the
same..just to be doubly sure abt the image in FLASH...i also observed the
hexdump of the kernel image(image.bin) on emacs..the bytes at the locations
matched exactly...

 by this..i concluded that the image is not corrupted..yes..i checked only
the first few bytes..50-100 maybe..and they matched in all three places...

 but some how even after the image is getting copied to RAM..the kernel is
not getting executed..it just prints
"jumping to the kernel startup...." to the console and stops...i am sure
that the kernel code is not getting executed because..i have also placed a
couple of microblaze_gpio_write()...and the onboard led status does not
change...here is the main() of my bootloader :

--------------------start--------------------------------
main()
{
        unsigned int *ddr_ptr = ddr_start;
        unsigned int *flash_ptr = flash_start;
        reset_uarts();
        flash_set_base((unsigned int *)FLASH_BASEADDR);
        flash_read_reset();

/* Ensure cmdline defaults to null (zero-length) string */
        cmdline[0]='\0';

    /* Copy Image from FLASH to RAM*/
       copy_image(flash_ptr, ddr_ptr, (gImageLen)/4);

        /*Verify the IMAGE*/
        verify_image(flash_ptr, ddr_ptr, (gImageLen)/4);

        /*Jump to starting address in RAM*/
        print("Jumping to kernel startup...\n\r\n\r");
        kernel_start = (void_fn)ddr_start;
        kernel_start(cmdline);
        print("this line should not get printed");
}

----------------------end--------------------------------


can anyone tell me what could be going wrong?..I am guessing that either
mdm/xmd is for some reasons placing a breakpoint  because of which the
kernel image is not getting executed..
..if anyone has faced this problem before..please let me know as to how
exactly does xmd/mdm work?...the docs don't have much information on such
details..i am especially interested in knowing more abt the xmd command
"rst"..the doc just mentions "rst=target reset" ..but i feel this problem
could be related to that..

thanks a bunch in advance for any help..

cheers

V.Anand
(www.tenet.res.in)









****************************************

-----
  Trouble with windows? Re boot....
  Trouble with Linux? Be root....
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