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imx233: add capability to boot OF or updater instead of Rockbox

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This commit adds the necessary code in the dualboot stub (bootloader) to
let rockbox control the boot process. In particular, rockbox can now choose
if the next boot will be normal (boot rockbox or OF on magic key), to OF
or to updater.

The intents (to be added in follow-up commits) are:
1) Let the user more easily reboot to the OF. On some targets it is not trivial,
especially in USB mode.
2) Automatically reboot to updater when the user drop firmware.sb at the root
of the drive (currently, the user needs to do that in OF USB mode)
3) Document this OF magic

Change-Id: I86df651dec048c318c6a22de74abb8c6b41aa9ad
This commit is contained in:
Amaury Pouly 2016-09-26 21:22:21 +01:00 • committed by Gerrit Rockbox
parent 5c50efc9ce
commit a983859291
13 changed files with 650 additions and 168 deletions
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1
firmware/SOURCES
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@ -572,6 +572,7 @@ target/arm/imx233/adc-imx233.c
target/arm/imx233/lradc-imx233.c
target/arm/imx233/pwm-imx233.c
target/arm/imx233/rtc-imx233.c
target/arm/imx233/dualboot-imx233.c
target/arm/imx233/button-imx233.c
#if IMX233_SUBTARGET >= 3700
target/arm/imx233/dcp-imx233.c