diff options
| author | Shawn Chang <citypw@gmail.com> | 2019-04-24 17:44:58 +0800 |
|---|---|---|
| committer | Anup Patel <anup@brainfault.org> | 2019-04-25 09:47:13 +0530 |
| commit | 03ec350c83511b8ac02b23f9ee16c7ac272bf113 (patch) | |
| tree | 7540a724bd7a9a9e693b4717a761f5b1afc18028 /docs/external | |
| parent | 10baa64c02f6746fd506136e0693aa2d592574fb (diff) | |
docs: Add a payload section about coreboot support #116
Signed-off-by: Shawn Chang <citypw@gmail.com>
Diffstat (limited to 'docs/external')
| -rw-r--r-- | docs/external/coreboot.md | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/docs/external/coreboot.md b/docs/external/coreboot.md new file mode 100644 index 0000000..fe2f7ba --- /dev/null +++ b/docs/external/coreboot.md @@ -0,0 +1,24 @@ +OpenSBI as coreboot payload +============================== + +[coreboot](https://www.coreboot.org/) is a free/libre and open source firmware platform support multiple hardware architectures( x86, ARMv7, arm64, PowerPC64, MIPS and RISC-V) and diverse hardware models. In RISC-V world, coreboot currently support HiFive Unleashed with OpenSBI as a payload to boot GNU/Linux: + +``` +SiFive HiFive unleashed's original firmware boot process: + +-----------+ ++------+ +------+ +------+ | BBL | +| MSEL |--->| ZSBL |--->| FSBL |--->| +-------+ ++------+ +------+ +------+ | | linux | + +---+-------+ + +coreboot boot process: + +---------------------------------------------------------------------+ + | coreboot | ++------+ +------+ | +-----------+ +----------+ +----------+ +-----------------------+ +| MSEL |-->| ZSBL |-->| | bootblock |->| romstage |->| ramstage |->| payload ( OpenSBI) | ++------+ +------+ | +-----------+ +----------+ +----------+ | +-------+ | + | | | linux | | + +---------------------------------------------+-------------+-------+-+ +``` + +The upstreaming work is still in progress. There's a [documentation](https://github.com/hardenedlinux/embedded-iot_profile/blob/master/docs/riscv/hifiveunleashed_coreboot_notes-en.md) about how to build [out-of-tree code](https://github.com/hardenedlinux/coreboot-HiFiveUnleashed) to load OpenSBI. |