From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 30 Jun 2004 21:38:12 +0200 To: Adrian Cox Cc: Sven Luther , linuxppc-dev@lists.linuxppc.org Subject: Re: Pegasos 2 support patch ... Message-ID: <20040630193812.GA30391@pegasos> References: <20040629165029.GA13468@pegasos> <1088587090.28598.3.camel@localhost> <20040630155027.GA27912@pegasos> <1088611966.28598.52.camel@localhost> <20040630162323.GA28483@pegasos> <1088613575.28598.59.camel@localhost> <20040630185231.GA29878@pegasos> <1088622301.28598.68.camel@localhost> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 In-Reply-To: <1088622301.28598.68.camel@localhost> From: Sven Luther Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Wed, Jun 30, 2004 at 08:05:01PM +0100, Adrian Cox wrote: > On Wed, 2004-06-30 at 19:52, Sven Luther wrote: > > On Wed, Jun 30, 2004 at 05:39:35PM +0100, Adrian Cox wrote: > > > The problem is that the via686 ide is hardwired to irqs 14 and 15 of the > > > i8259 interrupt controller internally, but the kernel believes that only > > > IDE controllers at the legacy address can have separate irqs for each > > > channel. > > > > Is this the case for each via ide controller ? If so why does it work on > > x86 ? > > Because on x86 the BIOS places the IDE controller at the legacy > addresses (0x1f0, 0x170), and then setup-pci.c spots that the via ide > controller is also the legacy IDE controller, and thus uses the legacy > irq numbers 14 and 15. Ah, ok, so this is just another x86-bug, and there should really be no major problem in rectifying it, and all the code should already be in setup-pci.c. We just need to find some way to detect that we are also in this case. Could this not be probed somehow ? In which case are the irq numbers the same ? Only when the via driver is on a stansalone pci card ? > What I'm looking for is a tidy way of achieving the same result on a > platform where the boot firmware did not put the via ide controller at > the legacy addresses. Ok, the main point would be to fins the tidy way for doing this. Friendly, Sven Luther ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/