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. > Also, the flash address is still 0xff800000, even though the kernel has > it as 0xf4000000. I guess this is because only a certain number of > address lines are actually connected through to the flash chip, and so > the chip can appear in multiple places? Yes, this could be the case. The flash is most likely "mirrored". > Does that make any more sense? Is it possible that the CFI code in > U-Boot doesn't consider the case when bus_width == 2? As mentioned above, this seems to be a common use-case (even though I don't have such a board at hand right now). Bus-width = 2 (vs. bus-width = 1) shouldn't really matter here. A CPU byte access to the flash address space should translate in one access cycle (8-bit) to the flash device. Sorry, no real idea whats going wrong without being able to test/debug on this platform. Cheers, Stefan -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: off...@denx.de _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
