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docs: platform: Update descriptions for qemu/sifive_u support

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With QEMU v4.2 release that has improved the emulation fidelity
of 'sifive_u' machine, OpenSBI v0.4 / U-Boot v2019.10-rc1 / Linux
kernel v5.3-rc2 images built for the SiFive HiFive Unleashed board
can be used out of the box without any special hack.

Update our documents to mention 'qemu/sifive_u' platform should
only be used with QEMU v4.1 or before, and it will be dropped
sometime in the future release.

Going forward, 'sifive/fu540' platform can be used on both real
hardware and QEMU v4.2+ 'sifive_u' machine.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Bin Meng
2019-09-23 05:49:15 -07:00
committed by Anup Patel
parent 98ee15ca3a
commit 8853758268
2 changed files with 20 additions and 0 deletions
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8
docs/platform/qemu_sifive_u.md
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@@ -7,6 +7,14 @@ platform.
To build this platform specific library and firmwares, provide the To build this platform specific library and firmwares, provide the
*PLATFORM=qemu/sifive_u* parameter to the top level `make` command line. *PLATFORM=qemu/sifive_u* parameter to the top level `make` command line.
Note with QEMU v4.2 release, the QEMU *sifive_u* machine has been updated to
closely match the SiFive HiFive Unleashed hardware and can therefore run the
same firmware as what gets loaded onto the board, and OpenSBI's *qemu/sifive_u*
platform should only be used with QEMU v4.1 release or before.
The special *qemu/sifive_u* platform support will be dropped in the future
OpenSBI release.
Platform Options Platform Options
---------------- ----------------

12
docs/platform/sifive_fu540.md
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@@ -4,6 +4,9 @@ The FU540-C000 is the world’s first 4+1 64-bit RISC-V SoC from SiFive.
The HiFive Unleashed development platform is based on FU540-C000 and capable The HiFive Unleashed development platform is based on FU540-C000 and capable
of running Linux. of running Linux.
With QEMU v4.2 or above release, the 'sifive_u' machine can be used to test
OpenSBI image built for the real hardware as well.
To build platform specific library and firmwares, provide the To build platform specific library and firmwares, provide the
*PLATFORM=sifive/fu540* parameter to the top level `make` command. *PLATFORM=sifive/fu540* parameter to the top level `make` command.
@@ -201,3 +204,12 @@ At U-Boot prompt execute the following boot command to boot Linux.
``` ```
bootm ${kernel_addr_r} - ${fdt_addr_r} bootm ${kernel_addr_r} - ${fdt_addr_r}
``` ```
QEMU Specific Instructions
--------------------------
If you want to test OpenSBI with QEMU 'sifive_u' machine, please follow the
same instructions above, with the exception of not passing FW_PAYLOAD_FDT_PATH.
This is because QEMU generates a device tree blob on the fly based on the
command line parameters and it's compatible with the one used in the upstream
Linux kernel.