u-boot about 2c35

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originally posted by iriver@Jun 15 2006, 07:06 PM

if i want run linux from my u-boot,what i will do,are there some changes to the u-boot! who can tell me the steps? thank you !

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To boot nios2 uclinux, you need the load address of zImage, which is sdram base + boot link offset (in kernel config, may be 0x500000 or 0x800000) . You may find the load address of zImage with

nios2-linux-uclibc-objdump -h zImage

The load addres is the vma of .text .

You need to use mkimage to convert zImage,with compress none.

to hippo

you mean that i need not change the u-boot in order to boot linux.now,my u-boot run on sdram,then if i want to run the linux,i only use the u-boot command to download the uncompress image into a sdram address,is it that?

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originally posted by iriver@Jun 19 2006, 06:26 PM

to hippo

you mean that i need not change the u-boot in order to boot linux.now,my u-boot run on sdram,then if i want to run the linux,i only use the u-boot command to download the uncompress image into a sdram address,is it that?

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Now you should program the uboot to flash, with nios2-flash-programmer (or uboot itself).

So that uboot will start on reset.

http://nioswiki.jot.com/wikihome/operating...flashprogrammer (http://nioswiki.jot.com/wikihome/operatingsystems/flashprogrammer)

Then you can use tftp from uboot to download linux image and run. Or you can program the linux image to flash and run it with a uboot script. You should not overlap those images both in sdram and flash.

http://www.denx.de/wiki/dulg/manual (http://www.denx.de/wiki/dulg/manual)

http://docs.blackfin.uclinux.org/doku.php?...oot_on_blackfin (http://docs.blackfin.uclinux.org/doku.php?id=das_u-boot_on_blackfin)

Hi iriver & hippo,

> You should not overlap those images both in sdram and flash.

Just FYI: Typically, u-boot relocates itself to the high end of memory, and the kernel copies

itself to the low end. u-boot doesn&#39;t care where the .img is stored -- so you can place it where

you like -- provided you follow hippo&#39;s advice and don&#39;t overlap ;-)

Regards,

--Scott