This patch adds CBUS UART dts support;
also it adds the necessary macros for DEBUG_LL.
qemu-malta supports three serial interfaces:
* two ports are provided by the FDC37M817
Super I/O; this chip is connected via LPC bus
to Intel 82371EB (PIIX4E) South Bridge;
* the third serial port is provided by
the discrete TI 16C550C (CBUS UART);
this chip is connected via CBUS directly
to the board's GT64120 North Bridge.
See Malta User's Manual (MD00048) for details.
CBUS UART Instructions for use:
1. Enable CONFIG_CONSOLE_ACTIVATE_ALL in .config
(or disable uart0 in dts) and compile barebox;
2. run qemu:
qemu-system-mips -nographic -nodefaults \
-monitor null -M malta -m 256 \
-serial null -serial null -serial stdio \
-bios barebox-flash-image
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
There are some reasons for using YAMON-style memory map:
* we can run Linux kernel from barebox;
* we can use GXemul for running barebox.
YAMON-style GT64120 memory map make move UART to the new position.
The files gt64120.h and mach-gt64120.h are imported from Linux.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit moves the C debug_ll code from
the MIPS <debug_ll_ns16550.h> header file to
the MIPS <asm/debug_ll_ns16550.h> header file,
so the C code and the asm code can use the same
register address macros.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Set fake DEBUG_LL_UART_DIVISOR to use <asm/debug_ll_ns16550.h>.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
To allow for some generic io accessors introduce io.h and use
this instead of asm/io.h throughout the tree.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
The machine uses only big-endian mode.
Only supported peripheral is serial port.
The machine supports only MIPS32 CPUs.
Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Antony Pavlov
Sascha Hauer