[PATCH -next v8 00/11] Add support for dynamic MMU configuration

[Ilias Apalodimas]

Hi Anshul,

Apologies for not looking at this earlier.

I'll have a look within the week.

Regards
/Ilias

On Mon, 6 Oct 2025 at 11:29, Anshul Dalal <anshuld at ti.com> wrote:
>
> Hi all,
>
> In U-Boot, TI only provides a single memory map for all k3 platforms, this
> does not scale for devices where atf and optee lie outside the range 0x80000000
> - 0x80080000 and 0x9e780000 - 0xa0000000 respectively.
>
> There are also issues for devices with < 2GiB of memory (eg am62SiP with 512MiB
> of RAM) as the maximum size for the first DRAM bank is hardcoded to 2GiB in the
> current memory map. Furthermore the second DRAM bank is mapped even for devices
> that only have a single bank.
>
> Therefore this patch set adds the required functionality to create the MMU table
> at runtime based on the device-tree.
>
> The patch set has been build tested on all effected platforms but boot-tested
> only on TI's K3 EVMs, the beagleplay and phytec's phycore-am6* platforms.
>
> The following effected boards have not been boot tested:
>  - verdin-am62
>  - iot2050
>
> Best Wishes,
> Anshul
> ---
> Changes in v8:
>  - Reserve extra space for page table entries for performing fixups
> v7: https://lore.kernel.org/u-boot/20250912121618.1074054-1-anshuld@ti.com/
>
> Changes in v7:
>  - Pick up R-by and Tested-by tags
>  - Use nobreak API for unmapping MMU region
>  - Better error messages and minor refactor
> v6: https://lore.kernel.org/u-boot/20250905081902.489345-1-anshuld@ti.com/
>
> Changes in v6:
>  - Make use of generic MMU APIs
>  - Extend core U-Boot functionality by adding mmu_unmap_reserved_mem and
>    mem_map_fix_dram_banks
>  - Keep same memory maps for SPL and U-Boot proper
>  - Add fdt fixups from SPL stage for reserved memory nodes
> v5: https://lore.kernel.org/u-boot/20250703133533.104758-1-anshuld@ti.com/
>
> Changes in v5:
>  - Don't create carveouts for every reserved-memory node
>  - Only create carveouts for ATF/OP-TEE
>  - Expand the call to k3_mem_map_init to vendor boards as well
>  - Map area for framebuffer for CONFIG_VIDEO=y platforms
> v4: https://lore.kernel.org/u-boot/20250618124210.1936140-1-anshuld@ti.com/
>
> Changes for v4:
>  - Add call to k3_mem_map_init for beagleplay
>  - Mark reserved regions as non-cacheable
>  - More debug logs
> v3: https://lore.kernel.org/u-boot/20250617135844.2873701-1-anshuld@ti.com/
>
> Changes for v3:
>  - Remove unused memory regions in SPL's map
>  - Add runtime addition of MMU entry for the framebuffer in SPL
>  - Refactor k3_mem_map_init to use standard u-boot APIs
>  - Unmap reserved-memory regions instead of keeping them uncached
> v2: https://lore.kernel.org/u-boot/20250610160833.1705534-1-anshuld@ti.com/
>
> Changes in v2:
> - Removed dependency to:
>   https://lore.kernel.org/u-boot/20250522150941.563959-1-anshuld@ti.com/
> v1: https://lore.kernel.org/u-boot/20250602120054.1466951-1-anshuld@ti.com/
> ---
>
> Anshul Dalal (11):
>   mach-k3: use minimal memory map for all K3
>   mach-k3: use custom enable_cache
>   arm: armv8: mmu: export mmu_setup
>   arm: armv8: invalidate dcache entries on dcache_enable
>   arm: armv8: mmu: add mem_map_fix_dram_banks
>   mach-k3: map all banks using mem_map_fix_dram_banks
>   arm: armv8: mmu: add mmu_unmap_reserved_mem
>   spl: split spl_board_fixups to arch/board specific
>   mach-k3: add reserved memory fixups for next boot stage
>   mach-k3: add carveouts for TFA and optee
>   arm: mach-k3: reserve space for page table entries
>
>  arch/arm/cpu/armv7m/cpu.c                  |  2 +-
>  arch/arm/cpu/armv8/cache_v8.c              | 58 ++++++++++++++++++++--
>  arch/arm/include/asm/armv8/mmu.h           | 24 +++++++++
>  arch/arm/mach-k3/arm64/arm64-mmu.c         | 40 +++++++--------
>  arch/arm/mach-k3/common.c                  | 55 ++++++++++++++++++++
>  arch/arm/mach-k3/include/mach/k3-ddr.h     |  6 +++
>  arch/arm/mach-rockchip/spl-boot-order.c    |  2 +-
>  arch/arm/mach-socfpga/spl_soc64.c          |  2 +-
>  board/beagle/beagley-ai/beagley-ai.c       |  2 +-
>  board/dhelectronics/dh_stm32mp1/board.c    |  2 +-
>  board/phytec/phycore_am62x/phycore-am62x.c |  2 +-
>  board/phytec/phycore_am64x/phycore-am64x.c |  2 +-
>  board/renesas/sparrowhawk/sparrowhawk.c    |  2 +-
>  board/starfive/visionfive2/spl.c           |  2 +-
>  board/ti/am62ax/evm.c                      |  2 +-
>  board/ti/am62px/evm.c                      |  2 +-
>  board/ti/am62x/evm.c                       |  2 +-
>  board/ti/am64x/evm.c                       |  2 +-
>  board/ti/j721e/evm.c                       |  2 +-
>  board/ti/j721s2/evm.c                      |  2 +-
>  board/ti/j722s/evm.c                       |  2 +-
>  board/ti/j784s4/evm.c                      |  2 +-
>  common/spl/spl.c                           | 12 +++--
>  include/spl.h                              | 12 +++--
>  24 files changed, 191 insertions(+), 50 deletions(-)
>
> --
> 2.51.0
>