On 11/11/2025 9:47 PM, Fabio Estevam wrote:
Hi Emanuele,
On Thu, Nov 6, 2025 at 7:22 AM Emanuele Ghidoli
<[email protected]> wrote:
Hi Fabio, Ye,
At Toradex we have been struggling since quite some time (back to 2018) with
Does this problem only affect early i.MX6ULL silicon samples?
Hi Emanuele,
I have same question as Fabio. Are these samples are early? Do you
know the time of receiving these sample? And could you show the part
number printed on the chip.
the temperature readings and the thermal shutdown behavior on i.MX6ULL. The
issue we observed is that the thermal shutdown seems to trigger too early.
I have investigated the history around this topic and verified some internal
notes in our bug tracker. With this revert applied, and on the devices we have
(all trimmed with value 0), the reported temperature increases by about 10 °C
compared to before the revert. The absolute accuracy of the readout is
questionable: for example, on a device kept at around 20 °C, the temperature
readout was ~19 °C before the revert, and ~31 °C after the revert.
Consider that for devices with fuse value of 6, there is a -10 degrees offset
after this revert (so, the other way around).
I understand that for Sven this revert improves stability during large XZ
decompression in userspace for few devices, but for us it means that the
thermal shutdown happens roughly 10 °C earlier, which is a serious issue in
our case.
I would kindly ask NXP to double-check how these devices were trimmed. My gut
feeling is that there might be an inconsistency, either the trimming scheme is
not backward-compatible (e.g. old and new devices behave differently, and the
code should cope, I don't know how, with this), or this patch must be reverted
(because introduces a regression).
Peng/Ye Li,
How does NXP suggest we handle this? Were the early i.MX6ULL parts
incorrectly fused?
I need to discuss it internally, will feedback you later.
Can the fuse be read and dynamically adjusted?
The fuse is locked by MEM_TRIM_LOCK. Emanuele, can you help to read it
by "fuse read 0 0 1".
Best regards,
Ye Li
Please advise, thanks.
