X-loader is for boards booting from the Samsung OneNAND flash chip. You have only 1K of RAM that's sucked out of the first NAND block's page 0 on power up, so you have to bootstrap the boot loader. You position u-boot at the 2K boundary (page 1) of block 0. X-loader's job is to initialize the RAM on your board and copy the NAND pages containing u-boot into it and then branch execution into the relocated u-boot reset vector in RAM.

Not many JTAG products support OneNAND, but I hear they're out there.

It sounds like you have a learning curve ahead of you, but I hope this helps. Check out my latest post on shoe-horning the x-loader function directly into u-boot. Good luck!

harsh poshtiwala wrote:

Hi Friends,

We are trying to bringup ARM926EJS core based board.

We need to port uboot on it,I learned that before i port uboot we need to port XLOADER and some JTAG memory initialization file as well as some of the plain files on the board.

We are using Platform toolset supplied by ST to flash uboot and all this files.

We have a JTAG probe as well that we would like to connect to board once we get our xloader flased.

So why do we need XLOADER and other files to port Uboot?

Any document to answer this ? or any commets ?

-- Thanks & Regards Harsh

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