On 05.08.21 17:32, Ahmad Fatoum wrote: > On 03.08.21 18:59, Ahmad Fatoum wrote: >> The i.MX8MM reference manual follows long established tradition in not >> documenting BootROM magic reboot codes. For older i.MX variants, the >> values can be seen in the bmode tables of Freescale's U-Boot patches. >> >> There are no such patches for the i.MX8M, but testing shows that >> >> mw 0x30390094 0x10 ; mw 0x30390098 0x40000000 >> >> is one of the configurations that trigger serial download on next warm >> reset on an i.MX8MM. Describe this in the device tree, so >> >> gpr.reboot_mode.next=serial reset -r imxwd-warm >> >> does the right thing for that SoC. > > As you are currently doing i.MX8MP serial boot work, could you apply this > series, boot barebox containing it (and the i.MX watchdog driver) > from eMMC and try out: > > mw 0x30390094 0x10 ; mw 0x30390098 0x40000000 > reset -r imxwd-warm > > If the 8MP is similar enough to the 8MM in this respect, the BootROM > should fall into serial download mode despite being strapped for > eMMC. FTR: The same sequence doesn't work on a 8MP. > > Thanks! > Ahmad > > >> >> This all might work for other i.MX8M variants as well, but the dtsi >> can be genericized later on when tested. >> >> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> >> --- >> Cc: David Jander <david@xxxxxxxxxxx> >> Cc: Lucas Stach <l.stach@xxxxxxxxxxxxxx> >> --- >> Documentation/boards/imx.rst | 29 +++++++++++++++++++++++++++++ >> arch/arm/dts/imx8mm-evk.dts | 1 + >> arch/arm/dts/imx8mm-prt8mm.dts | 1 + >> arch/arm/dts/imx8mm.dtsi | 18 ++++++++++++++++++ >> 4 files changed, 49 insertions(+) >> create mode 100644 arch/arm/dts/imx8mm.dtsi >> >> diff --git a/Documentation/boards/imx.rst b/Documentation/boards/imx.rst >> index 887b45c70881..4ce9d9808cc1 100644 >> --- a/Documentation/boards/imx.rst >> +++ b/Documentation/boards/imx.rst >> @@ -83,6 +83,35 @@ The images can also always be started as second stage on the target: >> >> barebox@Board Name:/ bootm /mnt/tftp/barebox-freescale-imx51-babbage.img >> >> +BootROM Reboot mode codes (bmode) >> +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >> + >> +For select SoCs, barebox supports communicating an alternative boot medium >> +that BootROM should select after a warm reset:: >> + >> + barebox@FSL i.MX8MM EVK board:/ devinfo gpr.reboot_mode >> + Driver: syscon-reboot-mode >> + Bus: platform >> + Parent: 30390000.reset-controller@xxxxxxxxxxx >> + Parameters: >> + next: normal (type: enum) (values: "normal", "serial") >> + prev: normal (type: enum) (values: "normal", "serial") >> + Device node: /soc@0/bus@30000000/reset-controller@30390000/reboot-mode >> + reboot-mode { >> + compatible = "barebox,syscon-reboot-mode"; >> + offset = <0x94 0x98>; >> + mask = <0xffffffff 0x40000000>; >> + mode-normal = <0x0 0x0>; >> + mode-serial = <0x10 0x40000000>; >> + }; >> + >> + barebox@FSL i.MX8MM EVK board:/ gpr.reboot_mode.next=serial reset -r imxwd-warm >> + >> +This will cause barebox to fall into serial download mode on an i.MX8MM. >> + >> +Different SoCs may have more possible reboot modes available. >> +See the section on :ref:`Reboot modes<reboot_mode>` for more information. >> + >> High Assurance Boot >> ^^^^^^^^^^^^^^^^^^^ >> >> diff --git a/arch/arm/dts/imx8mm-evk.dts b/arch/arm/dts/imx8mm-evk.dts >> index 1e8619ccf584..304f150307a3 100644 >> --- a/arch/arm/dts/imx8mm-evk.dts >> +++ b/arch/arm/dts/imx8mm-evk.dts >> @@ -7,6 +7,7 @@ >> /dts-v1/; >> >> #include <arm64/freescale/imx8mm-evk.dts> >> +#include "imx8mm.dtsi" >> >> / { >> chosen { >> diff --git a/arch/arm/dts/imx8mm-prt8mm.dts b/arch/arm/dts/imx8mm-prt8mm.dts >> index bdcdd0806243..abd758f2856e 100644 >> --- a/arch/arm/dts/imx8mm-prt8mm.dts >> +++ b/arch/arm/dts/imx8mm-prt8mm.dts >> @@ -7,6 +7,7 @@ >> /dts-v1/; >> >> #include <arm64/freescale/imx8mm.dtsi> >> +#include "imx8mm.dtsi" >> >> / { >> model = "Protonic PRT8MM"; >> diff --git a/arch/arm/dts/imx8mm.dtsi b/arch/arm/dts/imx8mm.dtsi >> new file mode 100644 >> index 000000000000..78bbacb2b1b2 >> --- /dev/null >> +++ b/arch/arm/dts/imx8mm.dtsi >> @@ -0,0 +1,18 @@ >> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) >> +/ { >> + aliases { >> + gpr.reboot_mode = &reboot_mode_gpr; >> + }; >> +}; >> + >> +&src { >> + compatible = "fsl,imx8mm-src", "fsl,imx8mq-src", "syscon", "simple-mfd"; >> + >> + reboot_mode_gpr: reboot-mode { >> + compatible = "barebox,syscon-reboot-mode"; >> + offset = <0x94>, <0x98>; /* SRC_GPR{9,10} */ >> + mask = <0xffffffff>, <0x40000000>; >> + mode-normal = <0>, <0>; >> + mode-serial = <0x00000010>, <0x40000000>; >> + }; >> +}; >> > > -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox