From a8e7b458168ac0be2d6f7faf391a3e0579650b95 Mon Sep 17 00:00:00 2001 From: Furquan Shaikh Date: Mon, 16 Nov 2020 23:05:35 -0800 Subject: 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 Reviewed-on: https://review.coreboot.org/c/coreboot/+/47660 Tested-by: build bot (Jenkins) Reviewed-by: Angel Pons --- Documentation/releases/coreboot-4.13-relnotes.md | 29 ++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'Documentation') 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. -- cgit v1.2.3