projects / people / ms / u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| da333ae7 MY |
1 | config DM_SERIAL |
| 2 | bool "Enable Driver Model for serial drivers" | |
| 3 | depends on DM | |
| 4 | help | |
| f94a1bed SG |
5 | 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. | |
| ff247b7a | 9 | |
| 2f964aa7 SG |
10 | config 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 | ||
| 36 | config DEBUG_UART_BASE | |
| 37 | hex "Base address of UART" | |
| 38 | depends on DEBUG_UART | |
| 39 | help | |
| 40 | This is the base address of your UART for memory-mapped UARTs. | |
| 41 | ||
| 42 | A default should be provided by your board, but if not you will need | |
| 43 | to use the correct value here. | |
| 44 | ||
| 45 | config DEBUG_UART_CLOCK | |
| 46 | int "UART input clock" | |
| 47 | depends on DEBUG_UART | |
| 48 | help | |
| 49 | The UART input clock determines the speed of the internal UART | |
| 50 | circuitry. The baud rate is derived from this by dividing the input | |
| 51 | clock down. | |
| 52 | ||
| 53 | A default should be provided by your board, but if not you will need | |
| 54 | to use the correct value here. | |
| 55 | ||
| ff247b7a MY |
56 | config UNIPHIER_SERIAL |
| 57 | bool "UniPhier on-chip UART support" | |
| 58 | depends on ARCH_UNIPHIER && DM_SERIAL | |
| 59 | help | |
| 60 | Support for the on-chip UARTs on the Panasonic UniPhier platform. |