| Message ID | 20250404141713.ac2ntcsjsf7epdfa@hiago-nb (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [REGRESSION] Kernel reboots unexpectdely on i.MX8X when Cortex-M4 is running and it was started by U-Boot bootaux | expand |
diff --git a/drivers/pmdomain/imx/scu-pd.c b/drivers/pmdomain/imx/scu-pd.c index 38f3cdd21042..0477b3fb4991 100644 --- a/drivers/pmdomain/imx/scu-pd.c +++ b/drivers/pmdomain/imx/scu-pd.c @@ -539,6 +539,9 @@ imx_scu_add_pm_domain(struct device *dev, int idx, return NULL; } + if (strstr("cm40", sc_pd->name) != NULL) + is_off = true; + ret = pm_genpd_init(&sc_pd->pd, NULL, is_off); if (ret) { dev_warn(dev, "failed to init pd %s rsrc id %d",
#regzbot introduced: 4f6c983261 Hi Peng and all, Commit 4f6c9832613b ("genpd: imx: scu-pd: initialize is_off according to HW state") introduced a regression where the Kernel reboots unexpectedly (without any warnings, crashes or errors) when the Cortex-M4 was loaded and running by U-Boot, using the bootaux command: # load mmc 0:2 ${loadaddr} /home/root/hello_world.bin # bootaux ${loadaddr} 0 # boot This is a simple hello world binary that prints a message into the M40.UART0 pin (demo from NXP MCUXpresso). Before this commit, everything worked as expected, Linux boots fine and the HMP core keeps running and printing messages to the UART. After the commit, the kernel reboots at the beggining of the boot process. The only relevant message is printed by U-Boot after reset: "Reset cause: SCFW fault reset" This commit was bisectabled, the same device tree, u-boot version, and SCFW versions were used. Reverting this commit fixes the issues. For testing purposes, I created the following patch which also fixes the issue: Test Environment: - Hardware: Colibri iMX8DX 1GB with Colbiri Evaluation Board. - U-Boot Version: 2024.04 - U-Boot Build info: SCFW 83624b99, SECO-FW c9de51c0, IMX-MKIMAGE 4622115c, ATF 7c64d4e The issue is not present on: v6.5 The real root cause is still unclear to me. Anybody has any ideas? I am happy to share more details if needed. Cheers, Hiago.