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documentation/arm64/imx9: add imx95 support

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Signed-off-by: lipengfei28 <lipengfei28@xiaomi.com>
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lipengfei28 2025-07-28 10:53:49 +08:00 • committed by Alan C. Assis
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Documentation/platforms/arm64/imx9/boards/imx95-a55-evk/index.rst Normal file
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=====================
i.MX95 Evaluation Kit
=====================
.. tags:: chip:imx95, arch:arm64
The kit i.MX95 Evaluation Kit has a pre-installed Linux image which contains
u-boot and the i.MX95 reference Linux installation.
Below is a set of instructions on how to run NuttX on the i.MX95 EVK, on top
of the u-boot.
U-Boot configuration
--------------------
Two things need to be configured on u-boot before NuttX can be loaded:
* u-boot data cache must be turned off
* u-boot must stop to the u-boot console, i.e. the Linux payload must not be
loaded
--------------
Manual option:
--------------
1. Disable u-boot autostart (needs to be done only once):
.. code:: console
Hit any key to stop autoboot: 0
u-boot=> setenv bootdelay -1
u-boot=> saveenv
Saving Environment to MMC... Writing to MMC(0)... OK
u-boot=> reset
2. On every boot, the data cache must be disabled for options 2 and 3 to work
.. code:: console
u-boot=> dcache off
-----------------
Automated option:
-----------------
Replace the default bootcmd to disable dcache automatically:
.. code:: console
u-boot=> setenv bootdelay 0
u-boot=> setenv bootcmd dcache off
u-boot=> saveenv
Saving Environment to MMC... Writing to MMC(0)... OK
u-boot=> reset
To restore the default bootcmd which starts Linux automatically:
.. code:: console
u-boot=> setenv bootcmd run distro_bootcmd;run bsp_bootcmd
u-boot=> saveenv
Saving Environment to MMC... Writing to MMC(0)... OK
u-boot=> reset
The default bootcmd is:
.. code:: console
u-boot=> env print bootcmd
bootcmd=run distro_bootcmd;run bsp_bootcmd
Loading and running the NuttX image
===================================
You have four options:
1. Load via u-boot from SD-card
2. Run from SD-card, without u-boot
Option 1: load via u-boot from SD-card:
---------------------------------------
1. Build nuttx, and move ``nuttx.bin`` to MMC
2. Load from MMC and start nuttx payload
.. code:: console
u-boot=> dcache off; fatload mmc 0 0xa0100000 nuttx.bin; go 0xa0100000