Am 27. Dezember 2025 16:08:16 MEZ schrieb Tom Rini <[email protected]>: >On Sat, Dec 27, 2025 at 11:20:36PM +0900, Manjae Cho wrote: > >> Also add network testing example using virtio-net device, which >> should be helpful for users wanting to test U-Boot networking. >> >> Signed-off-by: Manjae Cho <[email protected]> >> --- >> doc/board/emulation/qemu-riscv.rst | 25 ++++++++++++++++++++++++- >> 1 file changed, 24 insertions(+), 1 deletion(-) >> >> diff --git a/doc/board/emulation/qemu-riscv.rst >> b/doc/board/emulation/qemu-riscv.rst >> index b5948d9affc..25fe7beb43f 100644 >> --- a/doc/board/emulation/qemu-riscv.rst >> +++ b/doc/board/emulation/qemu-riscv.rst >> @@ -43,7 +43,7 @@ qemu-riscv64_smode_defconfig instead. Note that U-Boot >> running in supervisor >> mode requires a supervisor binary interface (SBI), such as RISC-V OpenSBI. >> >> To create a U-Boot binary that can be utilized with a pflash device in QEMU >> -apply these addtional settings to qemu-riscv64_smode_defconfig: >> +apply these additional settings to qemu-riscv64_smode_defconfig: >> >> :: >> >> @@ -205,6 +205,29 @@ Invoke QEMU with: >> qemu-system-riscv64 -M virt -nographic \ >> -drive if=pflash,format=raw,unit=0,file=u-boot.bin,readonly=off >> >> +Testing with Network >> +-------------------- >> + >> +The QEMU virt machine supports VirtIO network devices, which can be useful >> for >> +testing network functionality in U-Boot. To add a network device, use the >> +following QEMU parameters: >> + >> +.. code-block:: bash >> + >> + qemu-system-riscv64 -nographic -machine virt -bios u-boot.bin \ >> + -m 256M -netdev user,id=net0 -device virtio-net-device,netdev=net0 >> + >> +This will create a VirtIO network device (eth0) that U-Boot can detect and >> use. >> +You can verify the network device is recognized by checking the boot output >> for:: >> + >> + Net: eth0: virtio-net#0 >> + >> +From the U-Boot prompt, you can test network functionality with:: >> + >> + => net list >> + => dhcp >> + => ping 10.0.2.2 >> + >> Debug UART >> ---------- >> > >This is a case where it's appropriate to do 2 patches. If Heinrich picks >it up as 1, that's fine too, but it is two distinct changes. >
Thank you Manjahe for addressing both the networking description as well as the typo. The added information does not look RISC-V specific. We already have doc/board/emulation/blkdev.rst. I would suggest to add a similar file for networking. There are different noteworthy network devices in emulation (e1000, virtio-net-pci, ...). You can have user network or use tap/tan. You may want to set the mac address. Tftp and DHCP provided by QEMU are of interest. So quite a bunch of information that we can add over time. Best regards Heinrich
