From: "Andrew Isaacson" <adi@broadcom.com>
To: linux-mips@linux-mips.org
Subject: [PATCH 12/12] pci-expmem-hack
Date: Wed, 19 Oct 2005 23:59:46 -0700 [thread overview]
Message-ID: <20051020065946.GL23899@broadcom.com> (raw)
In-Reply-To: <20051020065320.GA23857@broadcom.com>
CFE 1.2.5 and earlier fails to turn on the ExpMemEn bit in the
PCIFeatureControl register, which means that DMA does not work
beyond physical address 01_0000_0000, ergo to DRAM beyond 1GB.
With ExpMemEn turned on, 01_0000_0000-0f_ffff_ffff is mapped,
so DMA works for up to 61 GB of DRAM.
Will be fixed in CFE 1.2.6 (yet to be released).
Signed-Off-By: Andy Isaacson <adi@broadcom.com>
arch/mips/pci/pci-bcm1480.c | 8 ++++++++
1 files changed, 8 insertions(+)
Index: lmo/arch/mips/pci/pci-bcm1480.c
===================================================================
--- lmo.orig/arch/mips/pci/pci-bcm1480.c 2005-10-19 22:34:13.000000000 -0700
+++ lmo/arch/mips/pci/pci-bcm1480.c 2005-10-19 22:34:13.000000000 -0700
@@ -232,6 +232,14 @@
bcm1480_bus_status |= PCI_BUS_ENABLED;
}
+ /* turn on ExpMemEn */
+ cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40));
+ printk("PCIFeatureCtrl = %x\n", cmdreg);
+ WRITECFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40),
+ cmdreg | 0x10);
+ cmdreg = READCFG32(CFGOFFSET(0, PCI_DEVFN(PCI_BRIDGE_DEVICE, 0), 0x40));
+ printk("PCIFeatureCtrl = %x\n", cmdreg);
+
/*
* Establish mappings in KSEG2 (kernel virtual) to PCI I/O
* space. Use "match bytes" policy to make everything look
prev parent reply other threads:[~2005-10-20 7:05 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-20 6:53 [PATCH 0/12] bcm1480 support Andrew Isaacson
2005-10-20 6:54 ` [PATCH 1/12] sibyte-fixes Andrew Isaacson
2005-10-20 6:55 ` [PATCH 2/12] 1480-headers Andrew Isaacson
2005-10-20 6:55 ` [PATCH 3/12] sibyte-header-cleanup Andrew Isaacson
2005-10-20 6:56 ` [PATCH 4/12] sb1a-support Andrew Isaacson
2005-10-20 6:56 ` [PATCH 5/12] 1480-support Andrew Isaacson
2005-10-20 6:57 ` [PATCH 6/12] bigsur-support Andrew Isaacson
2005-10-20 6:57 ` [PATCH 7/12] sb1-cache-exc-handling Andrew Isaacson
2005-10-20 6:57 ` [PATCH 8/12] cerr-printk-not-prom-printf Andrew Isaacson
2005-10-20 10:49 ` Ralf Baechle
2005-10-20 11:02 ` Dominic Sweetman
2005-10-20 11:17 ` Ralf Baechle
2005-10-20 6:58 ` [PATCH 9/12] sbmac-fixes Andrew Isaacson
2005-10-20 6:58 ` [PATCH 10/12] 1480-pci-support Andrew Isaacson
2005-10-20 6:59 ` [PATCH 11/12] 1480-ht-support Andrew Isaacson
2005-10-20 6:59 ` Andrew Isaacson [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20051020065946.GL23899@broadcom.com \
--to=adi@broadcom.com \
--cc=linux-mips@linux-mips.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox