1 | # |
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2 | # $Id$ |
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3 | # |
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4 | |
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5 | Status |
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6 | ====== |
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7 | |
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8 | This driver appears to work OK for polled output at this point. |
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9 | |
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10 | It needs to be tested for: |
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11 | |
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12 | + polled input |
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13 | + interrupt driver output |
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14 | + interrupt driver input |
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15 | |
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16 | This driver does not support the new style RTEMS interrupt processing |
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17 | used on the i386 and some PowerPC models. |
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18 | |
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19 | Configuration Table Use |
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20 | ======================= |
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21 | |
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22 | sDeviceName |
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23 | |
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24 | The name of this device. |
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25 | |
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26 | deviceType |
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27 | |
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28 | This field must be SERIAL_NS16550. |
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29 | |
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30 | pDeviceFns |
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31 | |
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32 | The device interface control table. This may be: |
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33 | + ns16550_fns for interrupt driven IO |
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34 | + ns16550_fns_polled for polled IO |
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35 | |
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36 | deviceProbe |
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37 | |
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38 | This is the address of the routine which probes to see if the device |
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39 | is present. |
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40 | |
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41 | pDeviceFlow |
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42 | |
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43 | This field is ignored as hardware flow control is not currently supported. |
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44 | |
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45 | ulMargin |
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46 | |
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47 | This is currently unused. |
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48 | |
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49 | ulHysteresis |
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50 | |
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51 | This is currently unused. |
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52 | |
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53 | pDeviceParams |
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54 | |
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55 | This is set to the default settings. At this point, it is the default |
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56 | baud rate cast as a (void *). |
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57 | |
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58 | ulCtrlPort1 |
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59 | |
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60 | This field is the base address of this port on the UART. |
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61 | |
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62 | ulCtrlPort2 |
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63 | |
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64 | This field is unused for the NS16550. |
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65 | |
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66 | ulDataPort |
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67 | |
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68 | This field is the base address of this port on the UART. |
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69 | |
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70 | getRegister |
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71 | setRegister |
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72 | |
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73 | These follow standard conventions. |
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74 | |
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75 | getData |
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76 | setData |
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77 | |
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78 | These are unused since the TX and RX data registers can be accessed |
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79 | as regular registers. |
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80 | |
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81 | ulClock |
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82 | |
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83 | This is the clock constant which is divided by the desired baud |
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84 | to get the value programmed into the part. The formula for this |
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85 | for 9600 baud is: |
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86 | |
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87 | chip_divisor_value = ulClock / 9600. |
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88 | |
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89 | NOTE: When ulClock is 0, the correct value for a PC (115,200) is |
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90 | used. |
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91 | |
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92 | ulIntVector |
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93 | |
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94 | This is the interrupt vector number associated with this chip. |
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95 | |
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