Benjamin Herrenschmidt wrote: > On Thu, 2008-08-07 at 15:56 -0400, Steven A. Falco wrote: > >> I have added a compact flash to the external bus of a Sequoia >> (PPC440EPx) evaluation board. It is wired to CS1, and U-boot is set to >> configure CS1 to be at address 0xc1000000. U-boot can access the >> device, and reports the correct partition table, etc. so I believe the >> hardware is ok. >> >> I've created a device-tree entry under the EBC0 section of the >> sequoia.dts file: >> >> [EMAIL PROTECTED],0 { >> compatible = "harris,hydra_temp-pata", "ata-generic"; >> bank-width = <2>; >> reg = <1 0 20 1 80 20>; >> reg-shift = <4>; >> pio-mode = <4>; >> interrupts = <27 4>; >> interrupt-parent = <&UIC0>; >> }; >> }; >> >> This seems to be correct, because if I turn on debug in prom_parse, I >> see a translation that looks reasonable: >> > > Did you check that the resulting physical address was indeed where you > device is supposed to be addressed ? > > Ben >
They were wrong - I misinterpreted the reg-shift to be like the "stride" used by u-boot. But u-boot uses it as a multiplier, and reg-shift is truly a shift. So, I changed the shift to "2", and now the addresses are correct. I'm still having problems, but I'll start a new thread, because the new problem concerns interrupts. Thanks, Steve
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