Esp32S3 - ROM Messages Printing Control

[ThomasESP32]

Good afternoon,

I am working with an Esp32S3 and I have just read the Technical Reference Manual Part : 8.3 ROM Messages Printing Control

In the first table (Table 8-3. Control of ROM Messages Printing to UART0), it is written in SPI Boot Mode that
the register : RTC_CNTL_RTC_STORE4_REG[0] can be used to control the display of ROM messages to UART0
(With some GPIO et eFuses). The same thing for the display of ROM messages to USB.

My problem is that I thought that registers had standard values at reset. So, my question is how is it possible
to change the value of this register before reset so that it can be taken into account when the chip is started ??

Does this mean that the value written in this register is retained after a reset ?
How does it work when the power is turned OFF then ON again ?

For example, let's have a look at the last line of the table :
SPI Boot Mode, register RTC_CNTL_RTC_STORE4_REG[0] is 1 => ROM messages printing is disabled. Could you please explain me ??


Best regards,

Thank you
Thomas TRUILHE