If I remember correctly CONFIG_RAM_SIZE is not used for ESP32. And it was supposed to be set to 0 to avoid confusion.
For ESP32 only the heap is a bit messed up. Many agents poke holes inside the SRAM space for their own use. You can check https://github.com/apache/nuttx/blob/master/arch/xtensa/include/esp32/memory_layout.h And when SMP is enabled: https://github.com/apache/nuttx/blob/master/boards/xtensa/esp32/esp32-devkitc/src/esp32_boot.c#L92 Things are better with the ESP32S2&S3 and ESP32C series. On Fri, Apr 26, 2024 at 5:25 AM Bernd Walter <ti...@cicely7.cicely.de> wrote: > On Thu, Apr 25, 2024 at 09:36:25PM -0300, Alan C. Assis wrote: > > Hi Bernd, > > > > You can use 320KB only if you don't need to use WiFi and BLE. > > > > The memory is used but the WiFi/BLE driver! > > > > Do you remember the old days where your video card used to eat your main > > memory and you should define in the BIOS how much memory the video card > > will use? > > > > Same thing here! ;-) > > 200k is a lot. > Interestingly I started with the ethernet setup and my intention was > ethernet > only, but in the meantime I do need wifi as well. > Anyways, ethernet is started and wifi compiled in as well. > There was a problem (in my old nuttx codebase at least) that the ESP32_emac > code didn't like to be compiled with CONFIG_ARCH_PHY_INTERRUPT, which the > wifi enable enforced. > I dissabled that in the esp32_emac code. > > However, I have ethernet started and wifi compiled in, but not started and > that's my meminfo: > total used free largest nused nfree > Umem: 230384 19120 211264 12995 > > So some RAM must have been added somewhere else. > > > > > Best Regards, > > > > Alan > > > > On Thu, Apr 25, 2024 at 8:59 PM Bernd Walter <ti...@cicely7.cicely.de> > > wrote: > > > > > The original ESP32 is said to have 320k RAM. > > > All board configs have the following: > > > CONFIG_RAM_SIZE=114688 > > > > > > Are RAM sections added later in the startup process or is there another > > > reason? > > > > > > -- > > > B.Walter <be...@bwct.de> https://www.bwct.de > > > Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm. > > > > > -- > B.Walter <be...@bwct.de> https://www.bwct.de > Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm. >
