TMS570LC4357: Limitation of using the memory swapping feature

Max Wittekind

Hi experts,

According to the Technical Reference Manual of the TMS570LC4357, the µC allows for swapping flash and RAM by setting MEMSW in the BMMCR-Register to 0x5h.

However, in section 2.2.1, there is a note that says:
"After the swap with the flash memory-mapped to 0x08000000, only 512 kB of the flash memory from 0x08000000 to 0x0807FFFF will be accessible by the bus masters."

Does this mean that once the memory is swapped, only the first 512 kilobytes of the flash memory are accessible? In other words, if we wanted to use this functionality with a bootloader, we would not be able to write the whole 4 MB of the flash memory?

Thank you and best regards,
Max

3 months ago

0 jagadish gundavarapu 3 months ago

TI__Guru* 77836 points

Hi Max,

I would suggest you test it once, because i found below thread from my senior colleague:

RM57L843: Q about the RM - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Here he is mentioning, on his testing he can be able to access more than 512KB as well. So better to test it.

Thanks & regards,
Jagadish.