| Message ID | 20250526083548.413834-2-mikko.rapeli@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | [v4,1/4] u-boot: disable CONFIG_BLOBLIST on genericarm64 and qemuarm64 | expand |
On Mon, May 26, 2025 at 11:35:45AM +0300, Mikko Rapeli wrote: > It enables qemu USB support which causes a reset > loop currently with u-boot. > > Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org> > --- > meta/conf/machine/qemuarm64.conf | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) This too feel like something that should be brought up on the U-Boot side.
Hi, On Tue, May 27, 2025 at 06:52:47PM -0600, Tom Rini wrote: > On Mon, May 26, 2025 at 11:35:45AM +0300, Mikko Rapeli wrote: > > > It enables qemu USB support which causes a reset > > loop currently with u-boot. > > > > Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org> > > --- > > meta/conf/machine/qemuarm64.conf | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > This too feel like something that should be brought up on the U-Boot > side. We saw these issues in 2023 on qemu but thought they were specific to our Trusted Substrate config with tf-a, OP-TEE and u-boot. Some public info is in: https://linaro.atlassian.net/browse/LEDGE-435 I know USB support is really tricky with timings etc so I don't expect it to work well with bootloaders. Hence did not dig deeper. Now that I saw this reset loop with KVM I will note the details down with reproduction steps and send to u-boot list. But I think overriding QB_OPT_APPEND is handy, wether it has USB setup or something else. Other layers in yocto ecosystem use qemuarm64 as basis machine with testing and may want to change this. Cheers, -Mikko
On Wed, May 28, 2025 at 11:02:44AM +0300, Mikko Rapeli wrote: > Hi, > > On Tue, May 27, 2025 at 06:52:47PM -0600, Tom Rini wrote: > > On Mon, May 26, 2025 at 11:35:45AM +0300, Mikko Rapeli wrote: > > > > > It enables qemu USB support which causes a reset > > > loop currently with u-boot. > > > > > > Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org> > > > --- > > > meta/conf/machine/qemuarm64.conf | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > This too feel like something that should be brought up on the U-Boot > > side. > > We saw these issues in 2023 on qemu but thought they were specific to our > Trusted Substrate config with tf-a, OP-TEE and u-boot. Some public info is > in: https://linaro.atlassian.net/browse/LEDGE-435 > > I know USB support is really tricky with timings etc so I don't expect > it to work well with bootloaders. Hence did not dig deeper. > > Now that I saw this reset loop with KVM I will note the details down > with reproduction steps and send to u-boot list. > > But I think overriding QB_OPT_APPEND is handy, wether it has USB setup > or something else. Other layers in yocto ecosystem use qemuarm64 as basis > machine with testing and may want to change this. I would say there are two parts to this. On the U-Boot side, USB is expected to work and we have active custodians dealing with it. Please work with Ilias and others to get a reproduceable set of steps with vanilla QEMU and report them to the U-Boot list with appropriate CC. On the OE side, it's all complicated enough that I would defer to Richard.
diff --git a/meta/conf/machine/qemuarm64.conf b/meta/conf/machine/qemuarm64.conf index d310445a34..f086729641 100644 --- a/meta/conf/machine/qemuarm64.conf +++ b/meta/conf/machine/qemuarm64.conf @@ -20,7 +20,7 @@ QB_SMP ?= "-smp 4" QB_CPU_KVM = "-cpu host -machine gic-version=3" # For graphics to work we need to define the VGA device as well as the necessary USB devices QB_GRAPHICS = "-device virtio-gpu-pci" -QB_OPT_APPEND = "-device qemu-xhci -device usb-tablet -device usb-kbd" +QB_OPT_APPEND ?= "-device qemu-xhci -device usb-tablet -device usb-kbd" # Virtio Networking support QB_TAP_OPT = "-netdev tap,id=net0,ifname=@TAP@,script=no,downscript=no" QB_NETWORK_DEVICE = "-device virtio-net-pci,netdev=net0,mac=@MAC@"
It enables qemu USB support which causes a reset loop currently with u-boot. Signed-off-by: Mikko Rapeli <mikko.rapeli@linaro.org> --- meta/conf/machine/qemuarm64.conf | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)