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| author | Furquan Shaikh <furquan@google.com> | 2020-11-16 23:05:35 -0800 |
|---|---|---|
| committer | Angel Pons <th3fanbus@gmail.com> | 2020-11-19 16:23:46 +0000 |
| commit | a8e7b458168ac0be2d6f7faf391a3e0579650b95 (patch) | |
| tree | 46d217346903d70bf3ac17aa0a17583cf7973fca /Documentation/releases | |
| parent | 900c3a32a3188b2753047492f6333c3c7c0268f3 (diff) | |
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>
Diffstat (limited to 'Documentation/releases')
| -rw-r--r-- | Documentation/releases/coreboot-4.13-relnotes.md | 29 |
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. |