ESP-WROVER-KIT V4.1 Custom bootloader hooks read memory

[satsok_n]

I am using the ESP-WROVER-KIT V4.1. I am running the bootloader_hooks example. I am trying to read SRAM within the 'bootloader_before_init' function.

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1. void bootloader_before_init(void) {
2.     /* Keep in my mind that a lot of functions cannot be called from here
3.      * as system initialization has not been performed yet, including
4.      * BSS, SPI flash, or memory protection. */
5.  
6.     char *p = (char *)0x400A0000;
7.     char first_byte = p[0];
8.    
9.     ESP_LOGI("HOOK", "This hook is called BEFORE bootloader initialization");
10. }

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Is there any way of reading memory at that point?