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

[Tim Harvey]

On Fri, Dec 4, 2015 at 5:09 AM, Stefan Roese <sr at denx.de> wrote:
> Hi Stefano,
>
>
> On 04.12.2015 12:49, Stefano Babic wrote:
>>
>> 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.
>
>
> Could you please add this description to some imx README in the
> U-Boot source tree? I'm pretty sure this could be helpful to others
> as well.
>

Stefano,

Agreed - this sounds like an excellent thing to document for IMX6 SPL!

Nice work!

Tim