[U-Boot] [PATCH v5 00/11] Rewrite ARMv8 layerscape MMU

[York Sun]

A recent debug revealed MMU for DDR shouldn't be enabled before
DDR is initialized. Otherwise, a "normal memory" mapping may cause
speculative access which may hang the system if accessing to DDR
is not allowed at time.  For Layerscape platforms, we have early
MMU setup to speed up execution on emulators. The solution is to
update MMU after DDR is ready. The same idea goes to final MMU as
well. Actual DDR size is used to create the mappings. Non-exist
address should be marked as "fault", i.e. invalid to avoid unwanted
speculative access. Break-before-make process is followed when
change is made for MMU.

Aside from the DDR size, reserved memory used for secure RAM and
Management Complex (MC) makes things more complicated. To simplify
it, a new global is added to track the reserved RAM. Secure RAM
is excluded from U-Boot MMU. The reserved RAM is still mapped
under U-Boot since we will need to copy data into it. Reserved
RAM is excluded when device tree is fixed up so OS won't see it.
An SoC level efi_add_known_memory() is implemented to add valid
memory banks. DP-DDR is not added as memory.

Some MC configurations are moved to Kconfig.

Verified on LS2080ARDB with regular Linux boot and distro boot from USB.

Changes in v5:
  Rename RESV_RAM_TOP to RESV_RAM in Kconfig
  Revise "help" message and add comment to explain how RESV_RAM is used.

Changes in v4:
  Revert the change of C bit in v3 patch.

Changes in v3:
  Instead of flushing d-cache, following the break-before-make process
  to change MMU table.
  Add a patch to drop early MMU setup for LS2080A SPL build.

Changes in v2:
  Add change to efi mapping
  Implement SoC level efi_add_known_memory(). DP-DDR is skipped so no
  need to add it as reserved memory later.

York Sun (11):
  armv8: Add global variable resv_ram
  armv8: ls2080a: Move CONFIG_FSL_MC_ENET to Kconfig
  armv8: ls2080a: Move CONFIG_SYS_MC_RSV_MEM_ALIGN to Kconfig
  efi: Add a hook to allow adding memory mapping
  armv8: layerscape: Rewrite memory reservation
  driver: net: fsl-mc: Update calculation of MC RAM
  armv8: layerscape: Update MMU mapping with actual DDR size
  armv8: layerscape: Fix the sequence of changing MMU table
  armv8: ls2080a: Drop early MMU for SPL build
  armv8: mmu: Add a function to change mapping attributes
  armv8: layerscape: Update early MMU for DDR after initialization

 arch/arm/cpu/armv8/cache_v8.c                     |  72 ++++-
 arch/arm/cpu/armv8/fsl-layerscape/Kconfig         |  26 ++
 arch/arm/cpu/armv8/fsl-layerscape/cpu.c           | 331 ++++++++++++++++++++--
 arch/arm/cpu/armv8/fsl-layerscape/spl.c           |   3 -
 arch/arm/include/asm/arch-fsl-layerscape/config.h |   4 +-
 arch/arm/include/asm/arch-fsl-layerscape/cpu.h    |  12 +-
 arch/arm/include/asm/arch-fsl-layerscape/mmu.h    |   2 +-
 arch/arm/include/asm/armv8/mmu.h                  |   5 +
 arch/arm/include/asm/global_data.h                |   7 +
 arch/arm/include/asm/system.h                     |   1 +
 board/freescale/ls1012afrdm/ls1012afrdm.c         |  34 +--
 board/freescale/ls1012aqds/ls1012aqds.c           |  34 +--
 board/freescale/ls1012ardb/ls1012ardb.c           |  34 +--
 board/freescale/ls1043aqds/ddr.c                  |  29 --
 board/freescale/ls1043aqds/ls1043aqds.c           |   5 +
 board/freescale/ls1043ardb/ddr.c                  |  29 --
 board/freescale/ls1043ardb/ls1043ardb.c           |   7 -
 board/freescale/ls1046aqds/ddr.c                  |  29 --
 board/freescale/ls1046aqds/ls1046aqds.c           |   5 +
 board/freescale/ls1046ardb/ddr.c                  |  29 --
 board/freescale/ls1046ardb/ls1046ardb.c           |   7 -
 board/freescale/ls2080a/ddr.c                     |  55 ----
 board/freescale/ls2080a/ls2080a.c                 |  17 +-
 board/freescale/ls2080aqds/ddr.c                  |  55 ----
 board/freescale/ls2080aqds/ls2080aqds.c           |  17 +-
 board/freescale/ls2080ardb/ddr.c                  |  55 ----
 board/freescale/ls2080ardb/ls2080ardb.c           |  26 +-
 cmd/bdinfo.c                                      |   4 +
 common/board_f.c                                  |  32 +--
 drivers/net/fsl-mc/mc.c                           |  75 +----
 include/configs/ls2080a_common.h                  |   2 -
 lib/efi_loader/efi_memory.c                       |  14 +-
 scripts/config_whitelist.txt                      |   2 -
 33 files changed, 519 insertions(+), 540 deletions(-)

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2.7.4