DTE last call minutes

Please find below the meeting minutes for the last call. (all project documentation, meeting notes and slides, reference material can be found on the DTE portal https://collaborate.linaro.org/display/DTE)

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François-Frédéric Ozog (Linaro) -

Joakim Bech (Linaro) -

Atish Patra (Western Digital) -

Loic Pallardy (ST) -

Matthias Brugger -

Ilias Apalodimas (Linaro) -

Don (Harbin?) -

CVS -

Simon Glass (Google) -

Bill Mills (Linaro) -

Mark Brown (Arm) -

Mike Holmes (Linaro) -

Poonam (NXP) -

Ruchika Gupta (Linaro) -

Etienne Carriere (ST) -

Stefano Stabellini (Xilinx)

Notes:

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Linaro slides https://docs.google.com/presentation/d/1iCi8i7zAfYrXEXmQ0DfGB8DT3nPksX7zFJ7TbxRilo8/edit?ts=5f463d1d#slide=id.g7ddd37b719_1_67 for 9th September meeting -

Atish presentation on Risc-V boot process -

SBI - Supervisor Binary Interface -

Side note: -

Privilege level defines what the running software can do during its execution. Common usage of each privilege level is as follows: -

U-mode: user processes -

S-mode: kernel (including kernel modules and device drivers), hypervisor -

M-mode: bootloader, firmware -

SBI call looks like SMC call -

Actually SMC or HVC ? -

OpenSBI: Open source implementation of the RISC-V SBI specification (BSD-2 clause). -

RISC-V Boot flow -

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OpenSBI here is equivalent to TF-A in the Arm world, however, there is no security implemented at this point. -

The Linux kernel is booted by a single hardware thread identified by HART ID (HART = HARdware Thread) -

Then Linux can bring up other cores with HART SBI State Management (~ PSCI) -

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DT stuff -

Generate DT from RTL -

HART ID of boot core needs to be in chosen node -

Reuses topology DT node as defined by Arm64 -

Still work to do on standard IRQ controllers -

Platform level interrupt controller PLIC is SiFive specific -

Core Level Interrupt Controller (CLINT) -

Future -

Grub support -

EBBR compliance -

LinuxBoot support (was discussed last year but no more activity) -

SecureBoot (still drafting)