Hi,
i want to store some flags, bytes, at the end of my SRAM. This RAM section should preserve the information in case of a Reset e.g. WWDG1 Reset.
Before WWDG1 Reset is executed some program states should be stored in RAM and after Reset could be read out to get more information about what happend.
I defined the section in RAM as follows:
/* Memories definition */
MEMORY
{
RETRAM_interrupts (RX) : ORIGIN = 0x00000000, LENGTH = 32k
m_ipc_shm (RW) : ORIGIN = 0x38008000, LENGTH = 32K
SRAM1_FLASH (RX) : ORIGIN = 0x10000000, LENGTH = 192K
SRAM2_RAM (RWX) : ORIGIN = 0x10030000, LENGTH = (192K - 256)
FLAGS (RW) : ORIGIN = 0x1005FF00, LENGTH = 256
}
...
.noinit (NOLOAD):
{
KEEP(*(.FlagSection)) /* keep my variable even if not referenced */
} > FLAGS
Accessed by declaring array
uint8_t flag_buf[256] __attribute__((section (".FlagSection")));
I can move the information to flag_buf[] as desired and its there until a WWDG1 reset occurs.
After CM4 firmware starts again the FLAGS sections seems to be cleared and full of 0x00.
I thought with `NOLOAD` the section remains untouched?!
Does anybody did something like that or has a good advise.
Thanks
Regards
Jan
