[U-Boot] [PATCH] imx_common: check for Serial Downloader in spl_boot_device

[Stefano Babic]

Hi Fabio,

On 04/12/2015 11:51, Fabio Estevam wrote:
> Hi Stefano,
> 
> On Fri, Dec 4, 2015 at 7:02 AM, Stefano Babic <sbabic at denx.de> wrote:
>> Check for bmode before reading the boot device
>> to check if a serial downloader is started,
>> and returns UART if the serial downloader is set,
>> letting SPL to wait for an image if
>> CONFIG_SPL_YMODEM_SUPPORT is set.
>>
>> This allows to load again a SPL based board
>> with imx_usb_loader together with a tool
>> such as kermit.
> 
> Just curious: what were the commands you usned with imx_usb_loader to
> load SPL + u-boot.img?
> 

I did in this way:

sudo ../imx_usb_loader/imx_usb -v SPL
kermit kermit_uboot

And kermit_uboot (a kermit script) contains the lines:

set line /dev/ttyUSB1
set speed 115200
SET CARRIER-WATCH OFF
set flow-control none
set handshake none
set prefixing all
set file type bin
set protocol ymodem
send u-boot.img
c

The last "c" command tells kermit (from ckermit package in most distro)
to switch from command line mode to communication mode, and when the
script is finished, I get U-Boot prompt in the same shell. I tested on a
custom board booting from SPI (when internal mode is used), and changing
BOOT_MODE to serial, SPL starts automatically a download with y-modem.

Best regards,
Stefano

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