From: Eddie Dawydiuk <eddie@embeddedarm.com>
To: linuxppc-dev@ozlabs.org, Grant Likely <grant.likely@secretlab.ca>
Subject: PPC PCI bus registers
Date: Wed, 02 Sep 2009 16:44:55 -0700 [thread overview]
Message-ID: <4A9F0377.1070606@embeddedarm.com> (raw)
Hello,
I have a question regarding reading PCI bus registers from a user space
application running on a PPC SBC. Seeing as though the PCI bus is little endian
and PPC is big endian is it typical that one must perform a byte swap on all 16
and 32 bit register reads?
I've found this is true on a custom board I am working on(with an FPGA connected
via the PCI bus) and as a result I've added a byte swap command in busybox to
accommodate this feature...
--
Best Regards,
________________________________________________________________
Eddie Dawydiuk, Technologic Systems | voice: (480) 837-5200
16525 East Laser Drive | fax: (480) 837-5300
Fountain Hills, AZ 85268 | web: www.embeddedARM.com
next reply other threads:[~2009-09-02 23:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-02 23:44 Eddie Dawydiuk [this message]
2009-09-02 23:56 ` PPC PCI bus registers Grant Likely
2009-09-03 10:00 ` Benjamin Herrenschmidt
2009-09-16 18:58 ` Eddie Dawydiuk
2009-09-16 21:54 ` Benjamin Herrenschmidt
2009-09-16 22:11 ` Eddie Dawydiuk
2009-09-17 1:24 ` Benjamin Herrenschmidt
2009-09-17 16:11 ` Eddie Dawydiuk
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