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

[Tom Rini]

On Tue, Sep 06, 2016 at 10:53:30AM -0300, Otavio Salvador wrote:
> 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

Yes, I want to load SPL + u-boot.img so SPL will need to know that it's
going to fall back to ROM and allow it to be given u-boot.img to load
into DRAM :)

-- 
Tom
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