blob: 54e6f26d38d00a9a5b6781148f9fc1cd2d03b4b2 [file] [log] [blame]
Masahiro Yamadada333ae2014-10-23 22:26:09 +09001config DM_SERIAL
2 bool "Enable Driver Model for serial drivers"
3 depends on DM
4 help
Simon Glassf94a1be2015-02-05 21:41:35 -07005 Enable driver model for serial. This replaces
6 drivers/serial/serial.c with the serial uclass, which
7 implements serial_putc() etc. The uclass interface is
8 defined in include/serial.h.
Masahiro Yamadaff247b72014-10-23 22:26:11 +09009
Simon Glass2f964aa2015-01-26 18:27:07 -070010config DEBUG_UART
11 bool "Enable an early debug UART for debugging"
12 help
13 The debug UART is intended for use very early in U-Boot to debug
14 problems when an ICE or other debug mechanism is not available.
15
16 To use it you should:
17 - Make sure your UART supports this interface
18 - Enable CONFIG_DEBUG_UART
19 - Enable the CONFIG for your UART to tell it to provide this interface
20 (e.g. CONFIG_DEBUG_UART_NS16550)
21 - Define the required settings as needed (see below)
22 - Call debug_uart_init() before use
23 - Call debug_uart_putc() to output a character
24
25 Depending on your platform it may be possible to use this UART before
26 a stack is available.
27
28 If your UART does not support this interface you can probably add
29 support quite easily. Remember that you cannot use driver model and
30 it is preferred to use no stack.
31
32 You must not use this UART once driver model is working and the
33 serial drivers are up and running (done in serial_init()). Otherwise
34 the drivers may conflict and you will get strange output.
35
Simon Glass21d00432015-01-26 18:27:09 -070036choice
37 prompt "Select which UART will provide the debug UART"
38 depends on DEBUG_UART
39
40config DEBUG_UART_NS16550
41 bool "ns16550"
42 help
43 Select this to enable a debug UART using the ns16550 driver. You
44 will need to provide parameters to make this work. The driver will
45 be available until the real driver model serial is running.
46
47endchoice
48
Simon Glass2f964aa2015-01-26 18:27:07 -070049config DEBUG_UART_BASE
50 hex "Base address of UART"
51 depends on DEBUG_UART
52 help
53 This is the base address of your UART for memory-mapped UARTs.
54
55 A default should be provided by your board, but if not you will need
56 to use the correct value here.
57
58config DEBUG_UART_CLOCK
59 int "UART input clock"
60 depends on DEBUG_UART
61 help
62 The UART input clock determines the speed of the internal UART
63 circuitry. The baud rate is derived from this by dividing the input
64 clock down.
65
66 A default should be provided by your board, but if not you will need
67 to use the correct value here.
68
Simon Glassdd0b0122015-02-27 22:06:25 -070069config DEBUG_UART_SHIFT
70 int "UART register shift"
71 depends on DEBUG_UART
72 default 0 if DEBUG_UART
73 help
74 Some UARTs (notably ns16550) support different register layouts
75 where the registers are spaced either as bytes, words or some other
76 value. Use this value to specify the shift to use, where 0=byte
77 registers, 2=32-bit word registers, etc.
78
Masahiro Yamadaff247b72014-10-23 22:26:11 +090079config UNIPHIER_SERIAL
80 bool "UniPhier on-chip UART support"
81 depends on ARCH_UNIPHIER && DM_SERIAL
82 help
83 Support for the on-chip UARTs on the Panasonic UniPhier platform.