Stefan Roese wrote: > Hi Rogan, > > On Thursday 12 August 2010 14:07:03 Rogan Dawes wrote: >> I found the following configuration snippet for OpenOCD for the DNS323 >> at http://wiki.dns323.info/hardware:jtag: >> >> # driver addr size chip_width bus_width options >> flash bank cfi 0xff800000 0x800000 1 2 0 >> >> It seems that the key here is that the bus_width is set to 2, even >> though the chip_width is only 1. > > Seems not to be so uncommon: 8bit device on a 16bit external bus.
It is mostly likely a 8/16 bit wide device in 8 bit mode on an 8 bit external bus. Then all CFI data appears twice. Reason: the chip presents CFI data correctly (from the flash point of view) in 16 bit mode (flash A0 connected to CPU A1). If connected in 8 bit mode (flash A0 connected to CPU A1, flash A-1 connected to CPU A0) it still presents the data at the same adresses but the CFI driver gets misled because its told to try for 8 bit wide flash. Since that was an issue long ago, I made the board/emk/common/flash.c (CFI) driver. Anyone is welcome to add that special handling for 16 bit flash connected in 8 bit mode to the general CFI driver :) Best Regards, Reinhard _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
