Add initial USB support for the opentitanlib QEMU transport #28487
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This commit wires the necessary logic in the qemu transport to create fake pin which controls the VBUS gate over the usb command chardev. The fake pin uses number 254 and is aliases as "VBUS_SENSE_EN" which is the named used by some FPGA tests for a similar VBUS gate. Signed-off-by: Amaury Pouly <[email protected]>
Previously we were passing `-d guest_errors -d unimp` which causes QEMU to only print unimp errors. Signed-off-by: Amaury Pouly <[email protected]>
Signed-off-by: Amaury Pouly <[email protected]>
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See commits descriptions. Requires lowRISC/qemu#238 on the QEMU side