This patch turns on the auto RS485 mode in the 2nd external uart on PLU405 boards. This is a special mode of the used Exar XR16C2850 uart. Because these boards only have a 485 physical layer connected it's a good idea to turn it on by default.
Signed-off-by: Matthias Fuchs mf@esd.eu --- board/esd/plu405/plu405.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/board/esd/plu405/plu405.c b/board/esd/plu405/plu405.c index 61186a8..4a152c3 100644 --- a/board/esd/plu405/plu405.c +++ b/board/esd/plu405/plu405.c @@ -104,6 +104,7 @@ int misc_init_r (void) unsigned char *duart0_mcr = (unsigned char *)((ulong)DUART0_BA + 4); unsigned char *duart1_mcr = (unsigned char *)((ulong)DUART1_BA + 4); unsigned char *dst; + unsigned char fctr; ulong len = sizeof(fpgadata); int status; int index; @@ -203,6 +204,15 @@ int misc_init_r (void) out_8(duart0_mcr, 0x08); out_8(duart1_mcr, 0x08);
+ /* + * Enable auto RS485 mode in 2nd external uart + */ + out_8((void *)DUART1_BA + 3, 0xbf); /* write LCR */ + fctr = in_8((void *)DUART1_BA + 1); /* read FCTR */ + fctr |= 0x08; /* enable RS485 mode */ + out_8((void *)DUART1_BA + 1, fctr); /* write FCTR */ + out_8((void *)DUART1_BA + 3, 0); /* write LCR */ + return (0); }