92c55b682c
In very very space-constrained devices even the full UART driver is too large. In this case the debug UART can still be used in some cases. Add options to enable the UART driver in SPL and U-Boot proper. Enable both options by default. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Thomas Chou <thomas@wytron.com.tw>
247 lines
8.6 KiB
Plaintext
247 lines
8.6 KiB
Plaintext
#
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# Serial device configuration
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#
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menu "Serial drivers"
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config REQUIRE_SERIAL_CONSOLE
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bool "Require a serial port for console"
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# Running without a serial console is not supported by the
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# non-dm serial code
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depends on DM_SERIAL
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default y
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help
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Require a serial port for the console, and panic if none is found
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during serial port initialization (default y). Set this to n on
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boards which have no debug serial port whatsoever.
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config SERIAL_PRESENT
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bool "Provide a serial driver"
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depends on DM_SERIAL
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default y
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help
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In very space-constrained devices even the full UART driver is too
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large. In this case the debug UART can still be used in some cases.
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This option enables the full UART in U-Boot, so if is it disabled,
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the full UART driver will be omitted, thus saving space.
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config SPL_SERIAL_PRESENT
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bool "Provide a serial driver in SPL"
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depends on DM_SERIAL
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default y
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help
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In very space-constrained devices even the full UART driver is too
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large. In this case the debug UART can still be used in some cases.
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This option enables the full UART in SPL, so if is it disabled,
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the full UART driver will be omitted, thus saving space.
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config DM_SERIAL
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bool "Enable Driver Model for serial drivers"
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depends on DM
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help
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Enable driver model for serial. This replaces
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drivers/serial/serial.c with the serial uclass, which
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implements serial_putc() etc. The uclass interface is
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defined in include/serial.h.
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config DEBUG_UART
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bool "Enable an early debug UART for debugging"
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help
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The debug UART is intended for use very early in U-Boot to debug
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problems when an ICE or other debug mechanism is not available.
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To use it you should:
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- Make sure your UART supports this interface
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- Enable CONFIG_DEBUG_UART
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- Enable the CONFIG for your UART to tell it to provide this interface
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(e.g. CONFIG_DEBUG_UART_NS16550)
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- Define the required settings as needed (see below)
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- Call debug_uart_init() before use
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- Call debug_uart_putc() to output a character
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Depending on your platform it may be possible to use this UART before
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a stack is available.
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If your UART does not support this interface you can probably add
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support quite easily. Remember that you cannot use driver model and
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it is preferred to use no stack.
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You must not use this UART once driver model is working and the
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serial drivers are up and running (done in serial_init()). Otherwise
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the drivers may conflict and you will get strange output.
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choice
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prompt "Select which UART will provide the debug UART"
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depends on DEBUG_UART
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default DEBUG_UART_NS16550
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config DEBUG_UART_ALTERA_JTAGUART
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bool "Altera JTAG UART"
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help
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Select this to enable a debug UART using the altera_jtag_uart driver.
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You will need to provide parameters to make this work. The driver will
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be available until the real driver model serial is running.
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config DEBUG_UART_ALTERA_UART
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bool "Altera UART"
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help
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Select this to enable a debug UART using the altera_uart driver.
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You will need to provide parameters to make this work. The driver will
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be available until the real driver model serial is running.
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config DEBUG_UART_NS16550
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bool "ns16550"
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help
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Select this to enable a debug UART using the ns16550 driver. You
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will need to provide parameters to make this work. The driver will
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be available until the real driver model serial is running.
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config DEBUG_EFI_CONSOLE
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bool "EFI"
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depends on EFI_APP
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help
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Select this to enable a debug console which calls back to EFI to
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output to the console. This can be useful for early debugging of
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U-Boot when running on top of EFI (Extensive Firmware Interface).
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This is a type of BIOS used by PCs.
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config DEBUG_UART_S5P
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bool "Samsung S5P"
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help
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Select this to enable a debug UART using the serial_s5p driver. You
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will need to provide parameters to make this work. The driver will
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be available until the real driver-model serial is running.
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config DEBUG_UART_ZYNQ
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bool "Xilinx Zynq"
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help
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Select this to enable a debug UART using the serial_zynq driver. You
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will need to provide parameters to make this work. The driver will
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be available until the real driver-model serial is running.
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config DEBUG_UART_APBUART
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depends on LEON3
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bool "Gaisler APBUART"
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help
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Select this to enable a debug UART using the serial_leon3 driver. You
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will need to provide parameters to make this work. The driver will
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be available until the real driver model serial is running.
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endchoice
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config DEBUG_UART_BASE
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hex "Base address of UART"
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depends on DEBUG_UART
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help
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This is the base address of your UART for memory-mapped UARTs.
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A default should be provided by your board, but if not you will need
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to use the correct value here.
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config DEBUG_UART_CLOCK
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int "UART input clock"
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depends on DEBUG_UART
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help
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The UART input clock determines the speed of the internal UART
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circuitry. The baud rate is derived from this by dividing the input
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clock down.
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A default should be provided by your board, but if not you will need
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to use the correct value here.
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config DEBUG_UART_SHIFT
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int "UART register shift"
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depends on DEBUG_UART
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default 0 if DEBUG_UART
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help
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Some UARTs (notably ns16550) support different register layouts
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where the registers are spaced either as bytes, words or some other
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value. Use this value to specify the shift to use, where 0=byte
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registers, 2=32-bit word registers, etc.
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config DEBUG_UART_BOARD_INIT
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bool "Enable board-specific debug UART init"
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depends on DEBUG_UART
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help
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Some boards need to set things up before the debug UART can be used.
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On these boards a call to debug_uart_init() is insufficient. When
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this option is enabled, the function board_debug_uart_init() will
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be called when debug_uart_init() is called. You can put any code
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here that is needed to set up the UART ready for use, such as set
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pin multiplexing or enable clocks.
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config DEBUG_UART_ANNOUNCE
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bool "Show a message when the debug UART starts up"
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depends on DEBUG_UART
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help
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Enable this option to show a message when the debug UART is ready
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for use. You will see a message like "<debug_uart> " as soon as
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U-Boot has the UART ready for use (i.e. your code calls
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debug_uart_init()). This can be useful just as a check that
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everything is working.
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config ALTERA_JTAG_UART
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bool "Altera JTAG UART support"
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depends on DM_SERIAL
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help
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Select this to enable an JTAG UART for Altera devices.The JTAG UART
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core implements a method to communicate serial character streams
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between a host PC and a Qsys system on an Altera FPGA. Please find
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details on the "Embedded Peripherals IP User Guide" of Altera.
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config ALTERA_JTAG_UART_BYPASS
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bool "Bypass output when no connection"
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depends on ALTERA_JTAG_UART
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help
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Bypass console output and keep going even if there is no JTAG
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terminal connection with the host. The console output will resume
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once the JTAG terminal is connected. Without the bypass, the console
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output will wait forever until a JTAG terminal is connected. If you
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not are sure, say Y.
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config ALTERA_UART
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bool "Altera UART support"
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depends on DM_SERIAL
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help
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Select this to enable an UART for Altera devices. Please find
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details on the "Embedded Peripherals IP User Guide" of Altera.
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config SYS_NS16550
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bool "NS16550 UART or compatible"
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help
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Support NS16550 UART or compatible. This can be enabled in the
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device tree with the correct input clock frequency. If the input
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clock frequency is not defined in the device tree, the macro
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CONFIG_SYS_NS16550_CLK defined in a legacy board header file will
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be used. It can be a constant or a function to get clock, eg,
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get_serial_clock().
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config SANDBOX_SERIAL
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bool "Sandbox UART support"
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depends on SANDBOX
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help
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Select this to enable a seral UART for sandbox. This is required to
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operate correctly, otherwise you will see no serial output from
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sandbox. The emulated UART will display to the console and console
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input will be fed into the UART. This allows you to interact with
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U-Boot.
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The operation of the console is controlled by the -t command-line
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flag. In raw mode, U-Boot sees all characters from the terminal
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before they are processed, including Ctrl-C. In cooked mode, Ctrl-C
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is processed by the terminal, and terminates U-Boot. Valid options
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are:
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-t raw-with-sigs Raw mode, Ctrl-C will terminate U-Boot
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-t raw Raw mode, Ctrl-C is processed by U-Boot
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-t cooked Cooked mode, Ctrl-C terminates
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config UNIPHIER_SERIAL
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bool "Support for UniPhier on-chip UART"
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depends on ARCH_UNIPHIER
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help
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If you have a UniPhier based board and want to use the on-chip
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serial ports, say Y to this option. If unsure, say N.
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endmenu
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