On 10 November 2016 at 02:49, Alison Wang b18965@freescale.com wrote:
This series is to support loading a 32-bit OS, the execution state
will change from AArch64 to AArch32 when jumping to kernel. The architecture information will be got through checking FIT image, then U-Boot will load 32-bit OS or 64-bit OS automatically.
Spin-table method is used for secondary cores to load 32-bit OS. The architecture information will be got through checking FIT image
and saved in the os_arch element of spin-table, then the secondary cores will check os_arch and jump to 32-bit OS or 64-bit OS automatically.
PSCI method can also be used for secondary cores to load 32-bit OS. As PSCI and secure monitor firmware framework are enabled, loading
32-bit OS is supported in such case. The default target exception level returned to U-Boot is EL2, so the corresponding work to switch to AArch32 EL2 and jump to 32-bit OS are done in U-Boot and secure firmware together.
Changes in v8:
- Fix the issue when U-Boot is running in EL2 or EL1.
Thanks for sticking with this. Great news: it works for my setup.
I tested booting an arm64 kernel on FVP Foundation and AEMv8 modes and on Juno R0, R1 and R2. I also tested and Versatile Express TC2 can still load it's Aarch32 kernel.
I didn't test running an Aarch32 kernel or any of the new functionality on my ARMv8 platforms.
But I checked and the patches are bisect-able on my ARMv8 platforms.
Tested-by: Ryan Harkin ryan.harkin@linaro.org
[Alison Wang] Thanks for your verification.
Best Regards, Alison Wang