-----Original Message----- From: u-boot-users-admin@lists.sourceforge.net [mailto:u-boot-users-admin@lists.sourceforge.net] On Behalf Of Srivatsan Sent: Friday, November 05, 2004 2:38 AM To: u-boot-users@lists.sourceforge.net Subject: [U-Boot-Users] Univesal bootloader in 2 stages Importance: High

Hi all,

 I understand that uboot works in 2 stages, one before

RAM is initialized and the other after RAM is initialized.

 But my requirement is, I would like to load the First

stage of uboot into Flash, then get the second stage of the boot loader thro' a fast Ethernet(This means that I require a Ethernet driver to run from Flash). In addition I would also like to start a Flash File system in first stage itself. Here's a summary

Uboot -- I stage [Running from Flash] CPU setup. Ethernet driver, support for TFTP. Flash driver. Flash file system.

Uboot - IIstage [Running from RAM] Other board initializations Device initializations CLI and booting the kernel image.

Would like to know whether the above split up of Uboot is feasible? Thanks for all your time. CPU will be mostly powerquicc II processor and the board is a customized board.

Regards, C.R.Srivatsan

Others have replied with more authority than I have, but I would like to point out that your "I stage++" exactly describes u-boot (the "++" being the running from RAM part) and your "II stage" exactly describes booting linux. You already have exactly what you asked for. Pour the bits into the board and It Just Works[tm] (after a little porting and debugging if you have new hardware ;-).

The current boot organization is going to be hard or impossible to improve. If you wish to do so, feel free -- that is the beauty of Open Source -- but you aren't likely to get a lot of help since you are solving a problem that others have already solved and are happy with the existing solution.

gvb

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