ESP-Wrover-Kit V4.1 reading internal SRAM

[kostas_espressif]

I am trying to read the internal SRAM of ESP-Wrover-Kit V4.1. I must read SRAM on its power on before being writen by any other code. I am using the example ''bootloader_override'' . I inserted the following C code in call_start_cpu0.

Code: Select all

char *p = (char *)0x3FFE0000; 
void __attribute__((noreturn)) call_start_cpu0(void)
{
    esp_rom_printf("start1 /n");
    char first_byte = p[0];
    esp_rom_printf("c %s",first_byte);
}

but when I run my code I am getting the following error

entry 0x400806a4
start1 /nc Fatal exception (28): LoadProhibited
epc1=0x40008044, epc2=0x00000000, epc3=0x00000000, excvaddr=0x0000000b, depc=0x00000000

Is there any way to read SRAM at this point ?