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Diffstat (limited to 'docs/firmware/payload_uboot.md')
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1 files changed, 9 insertions, 7 deletions
diff --git a/docs/firmware/payload_uboot.md b/docs/firmware/payload_uboot.md index 42bf55f..d30f6f8 100644 --- a/docs/firmware/payload_uboot.md +++ b/docs/firmware/payload_uboot.md @@ -4,30 +4,32 @@ U-Boot as a payload to OpenSBI [U-Boot](https://www.denx.de/wiki/U-Boot) is an open-source primary boot loader. It can be used as first and/or second stage boot loader in an embedded environment. In the context of OpenSBI, U-Boot can be specified as a payload to -OpenSBI firmware, becoming the boot stage following OpenSBI firmware +the OpenSBI firmware, becoming the boot stage following the OpenSBI firmware execution. The current stable upstream code of U-Boot does not yet include all patches necessary to fully support OpenSBI. To use U-Boot as an OpenSBI payload, the following out-of-tree patch series must be applied to the upstream U-Boot source -code. +code: HiFive Unleashed support for U-Boot https://lists.denx.de/pipermail/u-boot/2019-February/358058.html This patch series enables a single CPU to execute U-Boot. As a result, the next -stage boot code such as Linux kernel can also only execute a single CPU. U-Boot -SMP support for RISC-V can be enabled with the following additional patches. +stage boot code such as a Linux kernel can also only execute on a single CPU. +U-Boot SMP support for RISC-V can be enabled with the following additional +patches: https://lists.denx.de/pipermail/u-boot/2019-February/358393.html Building and Generating U-Boot images ===================================== -Please refer to U-Boot build documentation for detailed instructions on how to build U-Boot images. +Please refer to the U-Boot build documentation for detailed instructions on +how to build U-Boot images. -Once U-Boot images are built, Linux kernel image need to be converted to a format -that U-Boot understands. +Once U-Boot images are built, the Linux kernel image needs to be converted +into a format that U-Boot understands: ``` <uboot-dir>/tools/mkimage -A riscv -O linux -T kernel -C none -a 0x80200000 -e 0x80200000 -n Linux -d \ |