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

[Peng Fan]

Hi,

On Sat, Sep 10, 2016 at 04:40:47PM -0700, Eric Nelson wrote:
>Hi Tom,
>
>On 09/06/2016 07:15 AM, Tom Rini wrote:
>> On Tue, Sep 06, 2016 at 07:00:56AM -0700, Eric Nelson wrote:
>>> On 09/06/2016 06:40 AM, Tom Rini wrote:
>>>> On Fri, Sep 02, 2016 at 10:53:58PM +0200, Petr Kulhavy wrote:
>
><snip>
>
>>>>
>>>> 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!
>>>>
>>>
>>> SPL+u-boot.img could be bundled into a single image through the
>>> use of plugins which would require:
>>>
>>> - updates to mkimage to support plugins, and
>>> - Makefile updates to produce a third output (u-boot.imx?), and
>>> - an update to SPL startup on i.MX to check for the plugin flag
>>> and return to the boot ROM after startup (instead of loading
>>> U-Boot) if set.
>>>
>
>It appears that the mkimage support is present in a patch against v2015.04:
>
>http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/commit/tools/mkimage.c?h=imx_v2015.04_4.1.15_1.0.0_ga&id=3d9e1681
>
>Peng, can you up-stream this?
Hi Stefano,

I would like see your points on this. I tried to uptream plugin before, but rejected,
Since more people would like to see this in, do you agree to let plugin supported
in mainline?

Thanks,
Peng.

>
>>> Troy implemented the key bits back in 2012, and I provided
>>> some links here:
>>>
>>> http://lists.denx.de/pipermail/u-boot/2016-June/258784.html
>> 
>> Ah yes, this.  I really would like to see this come in as I think it'll
>> be required to really drop the old style u-boot.imx binaries for cases
>> like factory programming.  As well as the use cases outlined before too
>> about supporting multiple boards more easily.
>> 
>
>I'd also like to see this get pulled into main-line, and I just ran across
>another reason for supporting plugins.
>
>The i.MX7 LPSR mode resumes from a "power-off" state by going through
>the boot ROM, and it's up to the code loaded by the boot ROM to recognize
>the condition, take DRAM out of self-refresh and jump back into IRAM:
>
>http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/commit/board/freescale/mx7d_12x12_lpddr3_arm2/plugin.S?h=imx_v2015.04_4.1.15_1.0.0_ga&id=47f82f3978cda0c1fd637adcd9e8aa070f616493
>
>Some additional commentary is in this post on NXP community:
>
>https://community.nxp.com/thread/434057#comment-830672
>
>For this use case, SPL will be too heavyweight and plugin support is
>needed.
>
>Regards,
>
>
>Eric