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authorFurquan Shaikh <furquan@google.com>2020-11-16 23:05:35 -0800
committerAngel Pons <th3fanbus@gmail.com>2020-11-19 16:23:46 +0000
commita8e7b458168ac0be2d6f7faf391a3e0579650b95 (patch)
tree46d217346903d70bf3ac17aa0a17583cf7973fca
parent900c3a32a3188b2753047492f6333c3c7c0268f3 (diff)
downloadcoreboot-a8e7b458168ac0be2d6f7faf391a3e0579650b95.tar.xz
Doc/relnotes/4.13: Add details about resource allocator v4
This change adds details about the new resource allocator v4 in coreboot to the release notes for 4.13. Change-Id: I7071bdf0faffda61fc5941886c963181939c07e3 Signed-off-by: Furquan Shaikh <furquan@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/47660 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Angel Pons <th3fanbus@gmail.com>
-rw-r--r--Documentation/releases/coreboot-4.13-relnotes.md29
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/releases/coreboot-4.13-relnotes.md b/Documentation/releases/coreboot-4.13-relnotes.md
index 7c7102b844..8ce35da721 100644
--- a/Documentation/releases/coreboot-4.13-relnotes.md
+++ b/Documentation/releases/coreboot-4.13-relnotes.md
@@ -122,6 +122,16 @@ can be changed via `get_option()`. Keeping the log level of the first
console static ensures that we can see console output even if there's
a bug in the more involved code to query options.
+### Resource allocator v4
+
+A new revision of resource allocator v4 is now added to coreboot that supports
+mutiple ranges for allocating resources. Unlike the previous allocator (v3), it does
+not use the topmost available window for allocation. Instead, it uses the first
+window within the address space that is available and satisfies the resource request.
+This allows utilization of the entire available address space and also allows
+allocation above the 4G boundary. The old resource allocator v3 is still retained for
+some AMD platforms that do not conform to the requirements of the allocator.
+
### Add significant changes here
Deprecations
@@ -132,3 +142,22 @@ Deprecations
In order to minimize the usage of PCI bus mastering, the options we introduced in
this release will be dropped in a future release again. For more details, please
see [Preparations to minimize enabling PCI bus mastering](#preparations-to-minimize-enabling-pci-bus-mastering-in-coreboot).
+
+### Resource allocator v3
+
+Resource allocator v3 is retained in coreboot tree because the following platforms
+do not conform to the requirements of the resource allocation i.e. not all the fixed
+resources of the platform are provided during the `read_resources()` operation:
+
+* northbridge/amd/pi/00630F01
+* northbridge/amd/pi/00730F01
+* northbridge/amd/pi/00660F01
+* northbridge/amd/agesa/family14
+* northbridge/amd/agesa/family15tn
+* northbridge/amd/agesa/family16kb
+
+In order to have a single unified allocator in coreboot, this notice is being added
+to ensure that the platforms listed above are fixed before the next release. If there
+is interest in maintaining support for these platforms beyond the next release,
+please ensure that the platforms are fixed to conform to the expectations of resource
+allocation.