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ARM: Introduce function to switch to hypervisor mode

Keerthy u-boot 2 versions New

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  1. v2 Latest0 of 2 patches 0 repliesNew
  2. v10 of 2 patches 0 repliesSuperseded

Patches in v2 No applies recorded yet

None of the 2 patches the cover letter announces are in this archive.

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Cover letter [U-Boot] [PATCH v2 0/2] ARM: Introduce function to switch to hypervisor mode
Quoted 10 lines · Keerthy

On SoCs like DRA7, OMAP5 one cannot enable hypervisor mode directly from the u-boot because the ROM code puts the chip to supervisor mode after it jumps to boot loader.

Patch 1: Introduces a weak function which can be overridden specific to SoCs to switch to hypervisor mode.

Patch 2: overrides weak function in patch 1 switch cpu to hypervisor mode using the available ROM code hook early in the boot phase before the boot loader checks for hypervisor mode on OMAP5 based SoCs.

Hi Tom,

I request you to hold on merge of this series. I am doing some performance measurements. I see some drop. So analyzing and root causing.

Thanks,
Keerthy

Quoted 17 lines

Changes in v2:

* Fixed a compile time error on older defconfigs due to #ifdef issue.

Boot tested on DRA7-EVM and DRA72-EVM.

Keerthy (2):
ARM: Introduce function to switch to hypervisor mode
ARM: OMAP5+: Override switch_to_hypervisor function

  arch/arm/cpu/armv7/omap-common/lowlevel_init.S | 21 +++++++++++++++++++++
  arch/arm/cpu/armv7/start.S                     | 15 +++++++++++++++
  arch/arm/include/asm/system.h                  |  1 +
  3 files changed, 37 insertions(+)

Read the cover letter in its thread