[U-Boot] Building u-boot.imx and SPL simultaneously

[Otavio Salvador]

On Tue, Sep 6, 2016 at 10:40 AM, Tom Rini <trini at konsulko.com> wrote:
> On Fri, Sep 02, 2016 at 10:53:58PM +0200, Petr Kulhavy wrote:
>> Hi Fabio,
>>
>> On 02/09/16 22:03, Fabio Estevam wrote:
>> >You don't need u-boot.imx to boot the board with imx_usb_loader.
>> >Check the README update that Stefano did with this commit:
>> >
>> >commit 40f4839ce12adfc0223d6e3035cf9c3a4754a0ec
>> >Author: Stefano Babic <sbabic at denx.de>
>> >Date:   Fri Dec 11 17:30:42 2015 +0100
>> >
>> >     imx_common: check for Serial Downloader in spl_boot_device
>> >
>> >     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.
>> >
>> >     Signed-off-by: Stefano Babic <sbabic at denx.de>
>> >     CC: Tim Harvey <tharvey at gateworks.com>
>> >     CC: Fabio Estevam <Fabio.Estevam at freescale.com>
>> >     CC: Eric Nelson <eric.nelson at boundarydevices.com>
>> >     Reviewed-by: Eric Nelson <eric at nelint.com>
>> >     Tested-by: Eric Nelson <eric at nelint.com>
>> This is not particularly what I want to do. I want to load the
>> u-boot.img directly via the imx_usb_loader.
>> The kermit method is unacceptably slow for a production environment.
>
> Another place this doesn't work (which is where it doesn't work for me)
> is when the console is already open and I can't easily take it away to
> shoot over the next stage via Y-MODEM.
>
> Would it be possible to implement having the next stage also be sent via
> imx_usb_loader?  ie there's examples today of doing u-boot.imx + kernel
> + initrd via imx_usb_loader, so what would be needed for SPL +
> u-boot.img (+ kenrel + initrd) via imx_usb_loader?  Thanks!

It should be the same except that the image will be already loaded and
we need to instruct the SPL to jump to it. Am I missing something?

...
zImage-foo:load 0x82000000
core-image-minimal-foo.cpio.gz:load 0x83800000
u-boot.imx:clear_dcd,jump header

-- 
Otavio Salvador                             O.S. Systems
http://www.ossystems.com.br        http://code.ossystems.com.br
Mobile: +55 (53) 9981-7854            Mobile: +1 (347) 903-9750