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Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/boards/imx.rst | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/Documentation/boards/imx.rst b/Documentation/boards/imx.rst index 887b45c708..4ce9d9808c 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@30390000.of + 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 ^^^^^^^^^^^^^^^^^^^ |