Re: [Gumstix-users] How-to: Change boot device from NAND to MMC via touch screen or GPIO

[Keane, B. (STRX) <ben...@ka...>]

No problems! Glad I could help.

I like the idea of using the pen down IRQ - I might steal that ;)

> -----Original Message-----
> From: Paul Nolan [mailto:pa...@id...]
> Sent: Tuesday, 27 November 2012 1:36 PM
> To: General mailing list for gumstix users.
> Subject: [Gumstix-users] How-to: Change boot device from NAND to MMC
> via touch screen or GPIO
> 
> Thanks to ben...@ka... pointing me in the right direction, my
> project can now perform un-brickable updates.  By default it boots to NAND,
> but if there is a problem, or you need to install an upgrade, you can press the
> touch screen while u-boot is loading to boot from the MMC card, which can
> then present options for re-installing or upgrading the software installed to
> NAND.  This example tests GPIO_114_SPI1_NIRQ, which is connected to the
> touch controller, but by changing the itest values you can do test any GPIO.
> 
> u-boot script:
> 
> if itest.l *49054038 == 00010000; then echo "Touch Down";mmc rescan
> ${mmcdev}; run loaduimage; run mmcboot; else echo "No Touch";run
> nandboot; fi;
> 
> Thanks,
> --
> Paul Nolan, CEO Idruna Software Inc.
> 
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