From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefano Babic Date: Mon, 06 Oct 2014 17:42:33 +0200 Subject: [U-Boot] [PATCH 07/32] nitrogen6x: Allow U-Boot to be silent on UART2 In-Reply-To: <1412277413-30271-8-git-send-email-eric.nelson@boundarydevices.com> References: <1412277413-30271-1-git-send-email-eric.nelson@boundarydevices.com> <1412277413-30271-8-git-send-email-eric.nelson@boundarydevices.com> Message-ID: <5432B869.1020007@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi Eric, On 02/10/2014 21:16, Eric Nelson wrote: > Several customers are using UART2 (normally the serial console > for U-Boot) as connections to printers or other peripherals > that are not tolerant of stray inputs during reset. > > Provide a simple way to eliminate output on the serial port > by conditionally configuring these pads as GPIOs during > U-Boot. > > Signed-off-by: Eric Nelson > --- > board/boundary/nitrogen6x/nitrogen6x.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/board/boundary/nitrogen6x/nitrogen6x.c b/board/boundary/nitrogen6x/nitrogen6x.c > index e795492..621cdbc 100644 > --- a/board/boundary/nitrogen6x/nitrogen6x.c > +++ b/board/boundary/nitrogen6x/nitrogen6x.c > @@ -77,9 +77,15 @@ static iomux_v3_cfg_t const uart1_pads[] = { > MX6_PAD_SD3_DAT7__UART1_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL), > }; > > +/* #define CONFIG_SILENT_UART */ Theoretically, we have already in U-Boot CONFIG_SILENT_CONSOLE, without the need to introduce a new CONFIG_. > static iomux_v3_cfg_t const uart2_pads[] = { > +#ifndef CONFIG_SILENT_UART > MX6_PAD_EIM_D26__UART2_TX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL), > MX6_PAD_EIM_D27__UART2_RX_DATA | MUX_PAD_CTRL(UART_PAD_CTRL), > +#else > + MX6_PAD_EIM_D26__GPIO3_IO26 | MUX_PAD_CTRL(UART_PAD_CTRL), > + MX6_PAD_EIM_D27__GPIO3_IO27 | MUX_PAD_CTRL(UART_PAD_CTRL), > +#endif I understand the reason, anyway this looks like a hack (uart is still configured while iomux is not correctly set). Can you check if your goal is simply reached with CONFIG_SILENT_CONSOLE ? Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de =====================================================================