Bootloader and SPI flash
Posted:
Mon Oct 13, 2014 6:14 pmby prozac
I have looked through what documentation has been released about the chip but can't find any detailed info about the bootloader and it's use/assumptions about the external flash chip. Being a SOIC8, I would suspect we could upgrade to a larger flash chip as long as it is still able to load the FW, right? My interest is in trying to get an SSL lib compiled in with some default certs or to be able to store some small html content for a true web UI. Anyone see why this wouldn't work?
Re: Bootloader and SPI flash
Posted:
Mon Oct 13, 2014 6:28 pmby jonsmirl
I believe it has to be 512KB or 2MB.
Re: Bootloader and SPI flash
Posted:
Wed Oct 15, 2014 8:56 pmby prozac
So, the closest I could find on winbonds site to what my boards have is:
http://www.winbond.com/hq/enu/ProductAndSales/ProductLines/FlashMemory/SerialFlash/W25Q40BW.htm. It looks like 1.8v 80MHz 4Mb (512KB) flash (though why they wouldn't use one tolerant of 3.3 seems strange). If that is the case, it looks like you could double the flash by simply swapping out for the 80BW, which is the same voltage and clock. Any reason it couldn't simply be "swapped" in? Does the bootloader just begin exec at a given offset?
Re: Bootloader and SPI flash
Posted:
Mon Jun 22, 2015 5:05 amby John Marini
It looks like the bootloader is in MCU ROM, not in SPI EEPROM itself... I try soldering bigger flash to my ESP-1
