Tristan Corrick has uploaded this change for review.

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Doc/nb/intel/haswell: Add a list of known issues

Change-Id: If0339831550f6c70e8056f78633e9a402f35a793
Signed-off-by: Tristan Corrick <tristan@corrick.kiwi>
---
M Documentation/mainboard/asrock/h81m-hds.md
M Documentation/northbridge/intel/haswell/index.md
A Documentation/northbridge/intel/haswell/known-issues.md
3 files changed, 36 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/55/30455/1

diff --git a/Documentation/mainboard/asrock/h81m-hds.md b/Documentation/mainboard/asrock/h81m-hds.md
index 460af8f..5e80f2b 100644
--- a/Documentation/mainboard/asrock/h81m-hds.md
+++ b/Documentation/mainboard/asrock/h81m-hds.md
@@ -78,6 +78,10 @@
   in coreboot. The `coretemp` driver can still be used for accurate CPU
   temperature readings from an OS.
 
+```eval_rst
+Please also see :doc:`../../northbridge/intel/haswell/known-issues`.
+```
+
 ## Untested
 
 - parallel port
diff --git a/Documentation/northbridge/intel/haswell/index.md b/Documentation/northbridge/intel/haswell/index.md
index 3eb8059..87fb56f 100644
--- a/Documentation/northbridge/intel/haswell/index.md
+++ b/Documentation/northbridge/intel/haswell/index.md
@@ -6,3 +6,7 @@
 ## Proprietary blobs
 
 - [mrc.bin](mrc.bin.md)
+
+## Issues
+
+- [Known issues](known-issues.md)
diff --git a/Documentation/northbridge/intel/haswell/known-issues.md b/Documentation/northbridge/intel/haswell/known-issues.md
new file mode 100644
index 0000000..d257265
--- /dev/null
+++ b/Documentation/northbridge/intel/haswell/known-issues.md
@@ -0,0 +1,28 @@
+# Known issues with Haswell
+
+These issues are specific to the Haswell architecture. For a given
+mainboard, there might be additional issues to those listed here.
+
+## PCIe graphics
+
+```eval_rst
+Using a PCIe graphics card for display output is not currently
+supported. This is because :doc:`./mrc.bin` requires workarounds to
+have such a feature working correctly.
+```
+
+However, there is a [patch on Gerrit][hsw-gfx-gerrit] that allows PCIe
+graphics to be used for display output. This patch is not guaranteed to
+be of the same level of quality as code committed to coreboot.
+
+Still, in some cases, a PCIe graphics card can be used for rendering,
+while the integrated graphics device is used for display output. This
+can be achieved under GNU/Linux by using [PRIME GPU offloading][PRIME].
+
+## PCIe 3.0
+
+Only PCIe 2.0 has been tested so far. PCIe 3.0 could potentially have
+stability issues.
+
+[PRIME]: https://wiki.archlinux.org/index.php/PRIME
+[hsw-gfx-gerrit]: https://review.coreboot.org/q/topic:%22haswell-graphics%22+(status:open%20OR%20status:merged)

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