RISC-V boot deep dive (Boot FLOW from 0 to Linux Kernel)

Make RISC-V boot like rest of industry U-boot for embedded, UEFI for consumer and servers

• Deep dive on RISC-V boot flow started from openSBI.

  • Mode switching (U/S/H/M), SBI calls, platform ops .. , etc.
  • Embedded boot sprawl: U-boot vs edk2/uEFI with GRUB2

• The latest code base of OpenSBI follow-up.

• EDKII (edk2) support status on RISC-V: uEFI support to run GRUB2 or load kernel directly as EFI STUB

• Trace RISC-V’s efistub implementation in LINUX.

• RISC-V ISA study.

Resources

• An introduction to the RISCV Architecture
• OpenSBI on github
• RISC-V OpenSBI Deep Dive (pdf 2019)
• An Introduction to RISC-V Boot Flow (pdf 2019)
• RISC-V Boot flow: What's next ? (FOSSDEM 2020)
• EDK2 UEFI on RISC-V (FOSDEM 2021)
  
• kernel.org - RISC-V efistub lib (.c)
• kernel.org - RISC-V Runtime (.c)
• kernel.org - RISC-V sbi calls on cpu ops (.c)

• kernel.org - RISC-V sbi ecall interface (.c)

  What was done for ARM in past ?

• uEFI grub2 on Raspberry Pi (Video 2016)

• Marrying U-Boot, uEFI and grub2 (Video 2017)

Linux kernel EFI boot Stub

• kerlen.org The EFI Boot Stub
• Gentoo Linux on EFI Boot Stub (Wiki)

Soft RISC-V by QEMU

• https://risc-v-getting-started-guide.readthedocs.io/en/latest/linux-qemu.html
• https://en.opensuse.org/openSUSE:RISC-V

Berry inspiration

• https://wiki.debian.org/RaspberryPi4#U-boot

• UEFI Boot for Mere Mortals

• Introduction To U-Boot for Beginners

Embedded Linux Boot Process

• Embedded Linux Booting Process (Multi-Stage Bootloaders, Kernel, Filesystem 2018)