Zephyr LPUART14 via DMA BUS Fault

[pavelrydl]

• Using NXP S32K344 chip
• Using LPUART14 via DMA (DMAMUX1)

The problem:
After calling uart_rx_enable, it calls the callback with BUFFER_REQUESTED. I Supply the second buffer and it crashes.
(Inside, it crashes on
This is a problem only with LPUART14 on DMAMUX1. LPUART0 on DMAMUX0 is not crashing and it's working.

It's interesting to see "BFAR Address: 0x40254000" as this address points to "SDA-AP". It's perhaps security problem, but I have no experience with that. Also I think all security are disabled by default...

Thank you!

Error:
[00:00:00.010,000] os: ***** BUS FAULT *****
[00:00:00.010,000] os: Precise data bus error
[00:00:00.010,000] os: BFAR Address: 0x40254000
[00:00:00.010,000] os: r0/a1: 0x4020c000 r1/a2: 0x00048000 r2/a3: 0x0000001a
[00:00:00.010,000] os: r3/a4: 0x0041126c r12/ip: 0x20402888 r14/lr: 0x00404393
[00:00:00.010,000] os: xpsr: 0x01000000
[00:00:00.010,000] os: s[ 0]: 0x0041126c s[ 1]: 0x00404393 s[ 2]: 0x00000010 s[ 3]: 0x00410250
[00:00:00.010,000] os: s[ 4]: 0x00000000 s[ 5]: 0x21000440 s[ 6]: 0x00000000 s[ 7]: 0x20000460
[00:00:00.010,000] os: s[ 8]: 0x00000004 s[ 9]: 0x00000010 s[10]: 0x00000020 s[11]: 0x204094c0
[00:00:00.010,000] os: s[12]: 0x204094c0 s[13]: 0x0040fa28 s[14]: 0x204094c0 s[15]: 0x404a4000
[00:00:00.010,000] os: fpscr: 0x00000000
[00:00:00.010,000] os: r4/v1: 0x20402888 r5/v2: 0x0040fa08 r6/v3: 0x00000011[0m
[00:00:00.010,000] os: r7/v4: 0x20000440 r8/v5: 0x404a401c r9/v6: 0x204021d0
[00:00:00.010,000] os: r10/v7: 0x0000061c r11/v8: 0x00000020 psp: 0x20409418
[00:00:00.010,000] os: EXC_RETURN: 0xfffffffd
[00:00:00.010,000] os: Faulting instruction address (r15/pc): 0x0040dc2c
[00:00:00.010,000] os: >>> ZEPHYR FATAL ERROR 25: Unknown error on CPU 0
[00:00:00.010,000] os: Current thread: 0x20401e18 (main)
[00:00:00.618,000] os: Halting system

DTS:

&lpuart14 {
pinctrl-0 = <&lpuart14_default>;
pinctrl-names = "default";
dmas = <&edma0 17 46>, <&edma0 18 47>;
dma-names = "tx", "rx";
current-speed = <1000000>;
data-bits = <8>;
parity = "none";
stop-bits = "1";
status = "okay";
};

&edma0 {
status = "okay";
};

PIN CRTL:
lpuart14_default: lpuart14_default {
group1 {
pinmux = <PTB20_LPUART14_TX_O>;
output-enable;
};
group2 {
pinmux = <PTB21_LPUART14_RX>;
input-enable;
};
};

Sample code:
main.txt

[manuargue]

Hi @pavelrydl . Thanks for opening this thread. Please let us know which commit of Zephyr you're using. Thanks

[pavelrydl]

I tested Zephyr 4.1.0, 4.2.0 and the latest one.

For more information, I also have a thread on NXP Community forums, where is more information
https://community.nxp.com/t5/S32K/S32K344-DMAMUX1-LPUART14-BUS-FAULT/td-p/2175838

[manuargue]

Hi @pavelrydl , it seems to be an issue in the Zephyr eDMA driver. Please see #96772 and kindly check if the solution proposed can help fixing it. Thanks