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

[Petr Kulhavy]

On 06/09/16 16:00, Eric Nelson wrote:
> Hi Tom,
>
> On 09/06/2016 06:40 AM, Tom Rini wrote:
>> On Fri, Sep 02, 2016 at 10:53:58PM +0200, Petr Kulhavy wrote:
>>
>> 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!
>>
> 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.
Maybe this jumping to RBL forth and back is not needed at all.
If the SPL+img was loaded as one chunk into DRAM instead of the on-chip 
RAM (would require DDR initialization via DCD as it happens for the IMX 
image) then the SPL could jump directly into the uboot image, couldn't it?

Cheers
Petr