After commit 91cc526b15 "MdeModulePkg/SerialDxe: Fix not able to change serial attributes", serial is initialized using the reset method that will call SetAttributes.
However, SetAttributes may not be supported by the driver and will return an error (i.e RETURN_UNSUPPORTED) that will be propagate and lead to UEFI failing to get the console setup. For instance, this is the case when using the Xen console driver. Fix it by instropecting the result and return RETURN_SUCCESS when the driver report it is not supported (i.e RETURN_UNSUPPORTED). Contributed-under: Tianocore Contribution Agreement 1.1 Signed-off-by: Julien Grall <julien.gr...@linaro.org> --- MdeModulePkg/Universal/SerialDxe/SerialIo.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/MdeModulePkg/Universal/SerialDxe/SerialIo.c b/MdeModulePkg/Universal/SerialDxe/SerialIo.c index ebcd927263..4253e0b8ea 100644 --- a/MdeModulePkg/Universal/SerialDxe/SerialIo.c +++ b/MdeModulePkg/Universal/SerialDxe/SerialIo.c @@ -238,6 +238,12 @@ SerialReset ( (UINT8) This->Mode->DataBits, (EFI_STOP_BITS_TYPE) This->Mode->StopBits ); + // + // The serial device may not support SetAttributes. + // Set the status to RETURN_SUCCESS to prevent later failure. + // + if ( Status == RETURN_UNSUPPORTED ) + return RETURN_SUCCESS; return Status; } -- 2.11.0 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel