[U-Boot] [PATCH] x86: conga-qeval20-qa3: Add README to explain the console UART options

[Bin Meng]

Hi Stefan,

On Mon, Sep 5, 2016 at 5:03 PM, Stefan Roese <sr at denx.de> wrote:
> This patch adds a small README to explain the 2 defconfig files and its
> usage for the different console UART options.
>
> Signed-off-by: Stefan Roese <sr at denx.de>
> Cc: Bin Meng <bmeng.cn at gmail.com>
> Cc: Simon Glass <sjg at chromium.org>
> ---
>  board/congatec/conga-qeval20-qa3-e3845/README | 23 +++++++++++++++++++++++
>  1 file changed, 23 insertions(+)
>  create mode 100644 board/congatec/conga-qeval20-qa3-e3845/README
>

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>

One nits below:

> diff --git a/board/congatec/conga-qeval20-qa3-e3845/README b/board/congatec/conga-qeval20-qa3-e3845/README
> new file mode 100644
> index 0000000..a784f3c
> --- /dev/null
> +++ b/board/congatec/conga-qeval20-qa3-e3845/README
> @@ -0,0 +1,23 @@
> +------------------------------
> +U-Boot console UART selection:
> +------------------------------
> +
> +The U-Boot port for this congatec board currently supports two different
> +configurations (defconfig files). The only difference is the UART that
> +is used as the U-Boot console UART. The default defconfig file:
> +
> +conga-qeval20-qa3-e3845_defconfig
> +
> +provides this console on the UART0 which is provided via a Winbond
> +Super-IO chip connected on the congatec Qseven 2.0 evaluation carrier
> +board (conga-QEVAL). This UART is the one provided with a SubD9
> +connector on the mainboard (the low one). The 2nd defconfig file:
> +
> +conga-qeval20-qa3-e3845-internal-uart_defconfig
> +
> +provides the U-Boot console on the BayTrail internal legacy UART.

nits: the ending period should be ,

> +Which is routed from the QSeven SoM to the X300 connector on the

nits: Which -> which

> +baseboard. Here is called COM2. The baseboard already provides the
> +RS232 level shifters. So a TTL-USB UART adapter does not work in
> +this case. The signals need to get connected directly to the
> +RS232 level signals of the PC UART via some adapter cable.
> --

Regards,
Bin