Dear Michael, Thanks for taking out time to extend help.
As per the RefManual the UART is taking the SCLK_UART Clock and as there are 4 channels (4 UARTS).
Following is from the public exynos 5250 manual (http://www.samsung.com/global/business/semiconductor/file/product/Exynos_5_D...)
"Four independent channels with asynchronous and serial input/output ports for general purpose (Channel 0 to 3), and One channel in ISP (ISP-UART Channel 0) … • Each UART contains a Baud-rate generator, a Transmitter, a Receiver and a Control Unit. The Baud-rate generator uses SCLK_UART."
-Regards Armdev Team
On 16-Mar-2014, at 3:55 pm, Michael Trimarchi michael@amarulasolutions.com wrote:
Hi
On Sun, Mar 16, 2014 at 11:07 AM, armdev armdev.ftm@gmail.com wrote:
Dear Michael, Yep didn't got any prints. So tried a hack. a) Booted using uart 2 b) set the GPACON c) Copied the config from 0x12c20000 to 0x12c30000 d)tried to write a char 0x41 (A) on 0x12c20020 0x12c30020, I got output on UART2 but not on UART3.
We would like to use both uarts. Have you used UART3, did the boot to UART3 worked for you ? So you see any problem with any of our steps listed in this / pref mail.
Are you sure that you don't need to clock uart logic? I don't have such board I'm trying just to help you
Michael
Thanks armdev team
On 16-Mar-2014, at 2:56 pm, Michael Trimarchi michael@amarulasolutions.com wrote:
Hi
On Fri, Mar 14, 2014 at 9:04 AM, armdev armdev.ftm@gmail.com 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
Did you change the board console output ;)?
Michael
-Regards armdev team @FTM _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
-- | Michael Nazzareno Trimarchi Amarula Solutions BV | | COO - Founder Cruquiuskade 47 | | +31(0)851119172 Amsterdam 1018 AM NL | | [`as] http://www.amarulasolutions.com |
-- | Michael Nazzareno Trimarchi Amarula Solutions BV | | COO - Founder Cruquiuskade 47 | | +31(0)851119172 Amsterdam 1018 AM NL | | [`as] http://www.amarulasolutions.com |