alexcekay opened a new pull request, #21405:
URL: https://github.com/apache/nuttx/pull/21405
## Summary
The i.MX9 FlexSPI driver only exists in `arch/arm64/src/imx9` for the
Cortex-A. This adds it to `arch/arm/src/imx9`, so the i.MX95 Cortex-M7 can use
the FlexSPI controller, e.g. for an octal NOR flash.
`imx9_flexspi.{c,h}` and `hardware/imx9_flexspi.h` are copies of the arm64
files. The only changes are:
- `arm_internal.h` instead of `arm64_internal.h`, and the paths and include
guards.
- The clock setup in `imx9_flexspi_initialize()`. The arm64 driver programs
the CCM directly (`imx9_ccm_gate_on()`, `imx9_ccm_configure_root_clock()`) with
i.MX93 clock IDs. These do not exist for the i.MX95 M7, where the clock root is
set over SCMI. Like the other arm/imx9 drivers (LPSPI, LPI2C, FlexCAN), the
driver now keeps a `clk_root` and calls `imx9_configure_clock()` with
`FLEXSPI1_CLK`, which the board defines in `board.h`, e.g.:
```c
#define FLEXSPI1_CLK (FLEXSPI1_CLK_ROOT_SYS_PLL1_DFS1_CLK | CLOCK_DIV(2))
```
The driver is enabled with the new `CONFIG_IMX9_FLEXSPI` option.
## Impact
- New option `CONFIG_IMX9_FLEXSPI`, default `n`. Nothing changes for
existing boards or configurations.
- A board that enables it must define `FLEXSPI1_CLK` in `board.h`. Without
it the build fails with `'FLEXSPI1_CLK' undeclared`, the same as for the other
arm/imx9 drivers using `clk_root`.
- The arm64 driver is unchanged.
- No in-tree arm/imx9 board enables FlexSPI yet.
## Testing
**Runtime, i.MX95 (Cortex-M7):**
- Tested in the context of PX4 on an i.MX95 board with a Macronix octal
flash (OPI DTR), port A1, `FLEXSPI1_CLK` from `SYS_PLL1_DFS1` / 2 (400 MHz
root).
- The board brings up the flash with `imx9_flexspi_initialize(0)` and
`FLEXSPI_SET_DEVICE_CONFIG`, then reads the flash ID, MCUboot runs and boots
PX4 from the flash:
```
flexspi_nor: root 400000000 Hz, RXCLKSRC 3, STS2 0x00000827, id 0xc2
*** Booting MCUboot build fefc398cc13ebbc527e297fe9df78cd98a359d75 ***
Booting from /dev/ota0...
HW arch: NXP_IMX95
PX4 git-hash: c5095fb91549674060ef36f2965ef1fdd67a755e
PX4 version: 1.18.0 80 (17956992)
PX4 git-branch: pr-board-imx95
OS: NuttX
OS version: Release 12.12.0 (202113279)
OS git-hash: b460f7d2da6eedc2f3f6557e11388a9fe5c52cd4
Build datetime: Oct 27 2026 17:42:35
Build uri: localhost
Build variant: default
Toolchain: GNU GCC, 13.2.1 20231009
PX4GUID: 000affff0000000000000000000000000000
MCU: IMX95, rev. 0
```
**Build (macOS, arm-none-eabi-gcc 13.2.1):**
- `imx95-evk:nsh` and `imx93-qsb:nsh` with `CONFIG_IMX9_FLEXSPI=y` and
`FLEXSPI1_CLK` added to `board.h`: builds without warnings (make).
`imx95-evk:nsh` also with CMake.
- Without `FLEXSPI1_CLK`: fails with `'FLEXSPI1_CLK' undeclared`, as
intended.
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