https://lists.01.org/pipermail/edk2-devel/2017-July/012385.html
reported the timeout processing in SerialRead is not consistent.
Since SerialPortPoll only checks the status of serial port and
returns immediately, and SerialPortRead does not really implement
a time out mechanism and will always wait for enough input,
it will cause below results:
1. If there is no serial input at all, this interface will return
timeout immediately without any waiting;
2. If there is A characters in serial port FIFO, and caller requires
A+1 characters, it will wait until a new input is coming and timeout
will not really occur.
This patch is to update SerialRead() to check SerialPortPoll() and
read data through SerialPortRead() one byte by one byte, and check
timeout against mSerialIoMode.Timeout if no input.
Cc: Heyi Guo <heyi.guo@linaro.org>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Set UART receive FIFO depth with PCD instead of fixed number "1".
The default value of PCD is also 1, so it makes no difference for
platforms which do not explicitly set this PCD.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Heyi Guo <heyi.guo@linaro.org>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
In "11.8 Serial I/O Protocol", UEFI 2.5 requires:
The default attributes for all UART-style serial device interfaces are:
(a) 115,200 baud,
(b) a 1 byte receive FIFO,
(c) a 1,000,000 microsecond timeout per character,
(d) no parity,
(e) 8 data bits,
(f) and 1 stop bit.
It also says, about the EFI_SERIAL_IO_MODE.ControlMask member:
(g) A mask of the Control bits that the device supports. The device must
always support the Input Buffer Empty control bit.
SerialDxe complies with requirement (b) via hard-coded constants. It
complies with requirements (a), (d), (e) and (f) through PCD defaults (see
MdePkg/MdePkg.dec):
(a) 115,200 baud:
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultBaudRate|115200|UINT64|0x00000020
(d) no parity:
# 1 - No Parity.<BR>
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultParity|1|UINT8|0x00000022
(e) 8 data bits:
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultDataBits|8|UINT8|0x00000021
(f) 1 stop bit:
# 1 - One Stop Bit.<BR>
gEfiMdePkgTokenSpaceGuid.PcdUartDefaultStopBits|1|UINT8|0x00000023
SerialDxe does not comply with requirements (c) and (g). In this patch, we
fix (c), and leave (g) for later.
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Ryan Harkin <ryan.harkin@linaro.org>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Star Zeng <star.zeng@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19700 6f19259b-4bc3-4df7-8a09-765794883524
This Serial driver layers on top of a Serial Port Library instance
to produce serial IO protocol.
There is also another SerialDxe implementation in CorebootPayloadPkg,
but SerialDxe from EmbeddedPkg should be better that also consumes
the extended interfaces GetControl/SetControl/SetAttributes in
EmbeddedPkg/Include/Library/SerialPortExtLib.h for serial IO protocol.
And the extended interfaces GetControl/SetControl/SetAttributes in
EmbeddedPkg/Include/Library/SerialPortExtLib.h has been upstream to
MdePkg/Include/Library/SerialPortLib.h.
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18966 6f19259b-4bc3-4df7-8a09-765794883524
Star Zeng
Heyi Guo
Laszlo Ersek