him wrote: > I have run into a problem I am having a hard time figuring out. > > I have an MPC7400 SBC (PCI bus based) that has a device X residing > at the following locations in memory: > > 0x1860 0000 - 0x186f ffff device control register space > 0xb000 0000 - 0xbfff ffff device memory space > > Now assume for a moment that NOTHING special needs to be done to > access either space once the system has booted and bus enumerator > have set things up. > > ioremap() of the first physical address returns a VALID virtual > address ... that I can read and write to. It works as expected > because there are signature values at various offsets in the control > register space. > The virtual address returned is EQUAL to the physical address > > ioremap() of the second physical address also returns what appears to > be a VALID virtual address although WRITES go nowhere and READS return > all ff's. > The virtual address returned is 0xc100 0000 > > > > Now my question ... I have the source for the port. Where should I focus > my efforts in trying to figure this out? > > I have read the device drivers book and certain that I am following > the rules. > > I should also mention that there is an IO controller seperate from the > MPC7400 that I use to verify that the device X control and memory exist > in THAT physical range. > > If Only I can access them through ioremap() > > Thanks
No idea up to now, but what kernel, what linux? is it VM linux or uClinux? Heinz -- with best regards / mit freundlichen Grüßen Heinz-Jürgen Oertel +=================================================================== | Heinz-Jürgen Oertel port GmbH http://www.port.de | mailto:[EMAIL PROTECTED] | phone +49 345 77755-0 fax +49 345 77755-20 | Regensburger Str. 7b, D-06132 Halle/Saale, Germany | CAN Wiki http://www.CAN-Wiki.info | Newsletter: http://www.port.de/engl/company/content/abo_form.html +=================================================================== - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
