[U-Boot-Users] BDI2000 and MPC8260

Rune Torgersen runet at innovsys.com
Thu Sep 1 18:44:07 CEST 2005

> -----Original Message-----
> From: Wolfgang Denk
> Sent: Thursday, September 01, 2005 10:50
> In message 
> <20050901111214.457804dc.ajz at cambridgebroadband.com> you wrote:
> > 
> > The problem I am seeing is that the bdi2000 cannot 
> communicate with the PM828 if the HRW is not
> > present in the flash device.  I.e. you need u-boot.bin 
> already loaded into flash in order to load
> > u-boot.bin into flash!
> This is normal; with an erased flash, the processor will read a  HRCW
> which  sets external bus arbitration and CPU core disabled - there is
> nothing left for the BDI to communicate with.

We have anoter solution working here. To initally program the HRCW into
flash we use another JTAG device (a Corellis JTAG interface) to wiggle
th pins on the 8260 to program the flash. This works, but is fairly
slow. To program 256 bytes of HRCW takes 10 - 15 seconds.

After this we switch to BDI2000 and program U-Boot.

This way we don't need yet another piece of HW on the board.

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