From: "Sarnath Kannan" <sparc64@rediffmail•com>
To: linuxppc-embedded@lists•linuxppc.org
Subject: "OpenPIC versus EPIC" in MPC8240 !
Date: 1 Nov 2001 10:13:02 -0000 [thread overview]
Message-ID: <20011101101302.15843.qmail@mailweb11.rediffmail.com> (raw)
Dear reader,
I am trying to enable interrupts on the sandpoint X2
board hosting MPC8240, in Mode 1.
I decided to use OPenPIC code (openpic.c) for EPIC,
as the MPC8240 manual claims that EPIC is an OpenPIC standard. But I find some disparities between the way EPIC's registers are organised and the way OpenPIC data
structures are declared.( openpic_defs.h )
According the OpenPIC data structure,
"OpenPIC_Source" resides at offset 0x50000
whereas the EPIC ( section 11 of MPC8240 manual)
says the it resides at 0x50200 ( See page 11-5)
So, there is absolutely no gaurantee that
openPIC code would work for EPIC, Am i right ?
One more, If some1 could give me a clear picture
of interrupt routing on sandpoint board, it would
be very useful.
From what i read, I have understood the following
Please correct me if I am wrong.
1. The INTA ( used by Function 0 of Winbond -
PCI/ISA bridge) is connected to IRQ0 of EPIC.
2. The PCI interrupts (INTx) are connected to the
remaining PINs of EPIC in some order. ( I dont
know which order they are connected )
Any help would be appreciated. Meanwhile, I am
reading the sandpoint manual also..( This one, I add
inorder to avoid replies like "RTFM")
Thanks for any help guys
Sarnath
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
next reply other threads:[~2001-11-01 10:13 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-01 10:13 Sarnath Kannan [this message]
2001-11-01 17:13 ` "OpenPIC versus EPIC" in MPC8240 ! Dan Malek
-- strict thread matches above, loose matches on Subject: below --
2001-11-07 14:11 Sarnath Kannan
2001-11-11 23:56 ` ashish anand
2001-11-12 8:41 Sarnath Kannan
2001-11-12 16:41 ` Dan Malek
2001-11-12 16:51 ` Dag Nygren
2001-11-12 16:58 ` Dan Malek
2001-11-12 18:00 ` Dag Nygren
2001-11-13 6:42 James F Dougherty
2001-11-13 7:17 ` Dag Nygren
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