| Message ID | 1F300D52-7D5A-47FA-B3B4-7254C5A409E8@gmail.com |
|---|---|
| State | Rejected |
| Delegated to: | Albert ARIBAUD |
| Headers | show |
Dear tomaz Waiting for your reply... On 28-Mar-2014, at 3:12 pm, armdev <armdev.ftm@gmail.com> wrote: > Dear Tomasz, > > On 16-Mar-2014, at 6:23 pm, Tomasz Figa <tomasz.figa@gmail.com> wrote: > >> Hi, >> >> On 14.03.2014 09:04, armdev wrote: >>> Hi, >>> >>> We are trying to enable the UART3 on COM18 pins of arndale board. The UART3 RXD and TXD are on pins 2 and 4 which as per the base board specification is connected as >>> >>> XuRXD3 : UART_3_RXD/GPA1[4] : 2 >>> XuTXD3 : UART_3_TXD/GPA1[5] : 4 >>> >>> As per the public reference manual of exynos 5250, there is a register GPACON (0x1140_0000) >>> Setting GPACON |= 0x0010_0000 should enable the pins, but I am not able to see any output on UART3. >>> >>> Can you please suggest what is the right procedure >> >> The register is GPA1CON and its GPA1CON[4] and [5] bit fields need both to be set to 0x2 - see Pad Control chapter of Exynos5250 public datasheet. Also GPA1PUD should be reconfigured to disable default pull-down on both pins, again you can find details of the register in the datasheet. >> >> Best regards, >> Tomasz > > Based on the steps provided, we are still not able to get some output on UART3 simultaneously with UART2. > Can you please help us find out what we are missing. > > On the current u-boot, Following was the observation and steps to enable UART3 on arndale > > Observations / Questions > —————————————— > a) The board has the default UART set to UART2 which is at 0x12c20000, while the include/configs/arndale.h has the UART_OFFSET set to 0x010000. > Shouldn’t it be set to 0x20000 ? > > b) board_uart_init in board/samsung/arndale/arndale.c is configuring all the uarts, > Clocks would be set properly for all 4 uarts ? > > Steps / Code Modified > —————————————— > a) GPAICON[4] and [5] set to 0x2 in board/samsung/arndale/arndale.c > b) GPA1PUD [4] and [5] set to 0. > > diff --git a/board/samsung/arndale/arndale.c b/board/samsung/arndale/arndale.c > index 9efc355..4fb291e 100644 > --- a/board/samsung/arndale/arndale.c > +++ b/board/samsung/arndale/arndale.c > @@ -102,12 +102,18 @@ static int board_uart_init(void) > int board_early_init_f(void) > { > int err; > - > + volatile unsigned int *gpa1con = (volatile unsigned int *)0x11400020; > + volatile unsigned int *gpa1pud = (volatile unsigned int *)0x11400028; > err = board_uart_init(); > if (err) { > debug("UART init failed\n"); > return err; > } > + serial_init_dev(2); > + serial_setbrg_dev(2); > + *gpa1con |= 0x00220000; > + *gpa1pud &= 0xfffff0ff; > + > return err; > } > #endif >
diff --git a/board/samsung/arndale/arndale.c b/board/samsung/arndale/arndale.c index 9efc355..4fb291e 100644 --- a/board/samsung/arndale/arndale.c +++ b/board/samsung/arndale/arndale.c @@ -102,12 +102,18 @@ static int board_uart_init(void) int board_early_init_f(void) { int err; - + volatile unsigned int *gpa1con = (volatile unsigned int *)0x11400020; + volatile unsigned int *gpa1pud = (volatile unsigned int *)0x11400028; err = board_uart_init(); if (err) { debug("UART init failed\n"); return err; } + serial_init_dev(2); + serial_setbrg_dev(2); + *gpa1con |= 0x00220000; + *gpa1pud &= 0xfffff0ff; + return err; } #endif