diff options
Diffstat (limited to 'Documentation/boards')
| -rw-r--r-- | Documentation/boards/imx.rst | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/Documentation/boards/imx.rst b/Documentation/boards/imx.rst index 6c16923340..5cc4676a96 100644 --- a/Documentation/boards/imx.rst +++ b/Documentation/boards/imx.rst @@ -86,8 +86,8 @@ The images can also always be started as second stage on the target: BootROM Reboot mode codes (bmode) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -For select SoCs, barebox supports communicating an alternative boot medium -that BootROM should select after a warm reset:: +For selected SoCs, barebox supports communicating an alternative boot medium +that the BootROM should select after a warm reset:: barebox@FSL i.MX8MM EVK board:/ devinfo gpr.reboot_mode Driver: syscon-reboot-mode @@ -107,10 +107,17 @@ that BootROM should select after a warm reset:: barebox@FSL i.MX8MM EVK board:/ gpr.reboot_mode.next=serial reset -w -This will cause barebox to fall into serial download mode on an i.MX8MM. +The example above will cause barebox to jump back into serial download mode on +an i.MX8MM by writing 0x10 into the *SRC_GPR9* register (offset 0x30390094) and +0x40000000 into the *SRC_GPR10* register (offset 0x30390098), and then issuing a +warm :ref:`reset <command_reset>`. Different SoCs may have more possible reboot modes available. -See the section on :ref:`Reboot modes<reboot_mode>` for more information. +Look for documentation of the *SRC_SBMR* and *SRC_GPR* registers in the +Reference Manual of your SoC; the values for the ``mode-*`` properties often +correspond directly to the boot fusemap settings. + +See the section on :ref:`Reboot modes<reboot_mode>` for general information. High Assurance Boot ^^^^^^^^^^^^^^^^^^^ @@ -161,13 +168,13 @@ keys/certificates are expected in these config variables (assuming HABv4): CONFIG_HABV4_IMG_CRT_PEM A CSF template is located in -``arch/arm/mach-imx/include/mach/habv4-imx6-gencsf.h`` which is preprocessed +``include/mach/imx/habv4-imx6-gencsf.h`` which is preprocessed by barebox. It must be included in the board's flash header: .. code-block:: none - #include <mach/habv4-imx6-gencsf.h> + #include <mach/imx/habv4-imx6-gencsf.h> Analogous to HABv4 options and a template exist for HABv3. |