With this patch set, we have a framework to generically support passing
reboot modes to previous bootloader stages as well as process them.
Stuff you can do with this:
linux$ reboot recovery
* fall into barebox menu prompt, unless overridden *
linux$ reboot emmc
* sources /env/bmode/emmc if available *
barebox$ gpr.reboot_mode.next=serial reset
* fall into imx-usb-loader mode *
To enable this, besides having kernel and bootloader driver support,
you'll need to describe in the device tree where the reboot mode is
to be stored and what reboot modes there are.
This patch set implements it for two SoC families:
stm32mp15x:
- All now support `reboot loader` and `reboot recovery` from Linux,
if the syscon exists (The reboot mode itself is fixed up).
i.MX6Q/DL:
- No OS communication by default, but you can now easily tell the
BootROM where to boot from after warm reset
One thing missing in this series is support for nvmem-reboot-mode.
I ported the kernel driver[], but didn't come around to test it.
Details inside. Feedback appreciated. :-)
[1]: https://github.com/a3f/barebox/tree/reboot_mode
Ahmad Fatoum (10):
usbgadget: autostart: support delayed usbgadget.autostart=1
drivers: add reboot-mode infrastructure
power: reset: reboot-mode: port syscon-reboot-mode support
power: reset: reboot-mode: fix up node into boot device tree
defaultenv: provide defaults for generic reboot modes
ARM: dts: stm32mp: setup syscon-reboot-mode on TAMP general purpose
register
ARM: stm32mp: remove custom reboot mode logic from arch code
power: reset: reboot-mode: support multi-word magic
power: reset: syscon-reboot-mode: support multi-word reboot modes
ARM: dts: i.MX6qdl: define BootROM reboot-mode on top of SRC_GPR{9,10}
Documentation/user/defaultenv-2.rst | 18 +-
Documentation/user/reboot-mode.rst | 95 ++++++++
arch/arm/dts/imx6qdl.dtsi | 21 ++
arch/arm/dts/stm32mp151.dtsi | 15 ++
.../mach-stm32mp/include/mach/bootsource.h | 12 -
arch/arm/mach-stm32mp/init.c | 16 +-
common/Kconfig | 5 +
common/startup.c | 16 ++
common/usbgadget.c | 6 +-
defaultenv/Makefile | 1 +
.../defaultenv-2-reboot-mode/bmode/bootloader | 3 +
.../defaultenv-2-reboot-mode/bmode/loader | 2 +
.../defaultenv-2-reboot-mode/bmode/recovery | 2 +
defaultenv/defaultenv.c | 2 +
drivers/Kconfig | 1 +
drivers/Makefile | 1 +
drivers/power/Kconfig | 2 +
drivers/power/Makefile | 2 +
drivers/power/reset/Kconfig | 16 ++
drivers/power/reset/Makefile | 3 +
drivers/power/reset/reboot-mode.c | 229 ++++++++++++++++++
drivers/power/reset/syscon-reboot-mode.c | 129 ++++++++++
include/linux/reboot-mode.h | 38 +++
include/of.h | 2 +
24 files changed, 604 insertions(+), 33 deletions(-)
create mode 100644 Documentation/user/reboot-mode.rst
create mode 100644 defaultenv/defaultenv-2-reboot-mode/bmode/bootloader
create mode 100755 defaultenv/defaultenv-2-reboot-mode/bmode/loader
create mode 100644 defaultenv/defaultenv-2-reboot-mode/bmode/recovery
create mode 100644 drivers/power/Kconfig
create mode 100644 drivers/power/Makefile
create mode 100644 drivers/power/reset/Kconfig
create mode 100644 drivers/power/reset/Makefile
create mode 100644 drivers/power/reset/reboot-mode.c
create mode 100644 drivers/power/reset/syscon-reboot-mode.c
create mode 100644 include/linux/reboot-mode.h
--
2.28.0
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