Sasi, Anoop IN BLR SISL wrote:

Hi all please help me

Am a beginner in Linux. I have a PC with UBUNTU 9.04 installed . I was trying to boot Linux PC from USB. I could able to boot PC with GRUB installed in USB .

Is it possible to boot the PC (X86 architecture) from USB with U-Boot in the USB?

Theoretically, yes. Practically, it would be a *LOT* of work and require hardware details that you probably cannot get (chipset register definitions, how to initialize them, etc.).

With GRUB, the manufacturer's BIOS initialize the chipset and then boots GRUB -> linux based on the already configured hardware. U-Boot initializes the hardware, so you need the information that the PC BIOS / hardware manufacturer has (and won't tell you) to replace BIOS+GRUB with U-Boot.

There is some support for x86 in u-boot, but it is for one (?) specific x86 CPU, the AMD sc520, and your PC probably isn't running that. http://git.denx.de/?p=u-boot.git;a=tree;f=cpu/i386;h=cf975ccb545ea90c755b573...

What all configuration changes I need do to make this possible?

That is a huge open-ended question. We don't have an answer.

I have downloaded U-boot then configured and build for X86 architecture (sc520_cdp_config) And made a bootable partition in usb and copied u-boot image in to it and tried to boot from usb but It is not working.

You probably don't have a sc520.

Please help me in this.................

Use the BIOS + GRUB. It works very well.

With best regards, Anoop Sasi

Best regards, gvb