MCUXpresso SDK中的主题 k66 and USB dedicated RAM https://community.nxp.com/t5/MCUXpresso-SDK/k66-and-USB-dedicated-RAM/m-p/678583#M177 <HTML><HEAD></HEAD><BODY><P>I was just looking through a .map file for my K66 based project and noticed 0x800 bytes (+ alignment) being used for&nbsp;USB_RAM_GAP.</P><P></P><P>Looking in my linker script I see that indeed we align to 512 bytes and reserve 0x800 bytes in the .bss section for this USB RAM stuff. However as far as I can tell the K66 doesn't support this at all, so we are just wasting 2KB of RAM here.</P><P></P><P>Am I correct in thinking I can remove this, and the&nbsp;m_usb_bdt and m_usb_global sections for both projects that don't use USB and projects that do. My tests suggest that I can indeed do this with no negative repercussions.</P><P></P><P>Thanks</P><P>Andy</P></BODY></HTML> Sat, 13 May 2017 18:23:06 GMT andrewparlane2 2017-05-13T18:23:06Z k66 and USB dedicated RAM https://community.nxp.com/t5/MCUXpresso-SDK/k66-and-USB-dedicated-RAM/m-p/678583#M177 <HTML><HEAD></HEAD><BODY><P>I was just looking through a .map file for my K66 based project and noticed 0x800 bytes (+ alignment) being used for&nbsp;USB_RAM_GAP.</P><P></P><P>Looking in my linker script I see that indeed we align to 512 bytes and reserve 0x800 bytes in the .bss section for this USB RAM stuff. However as far as I can tell the K66 doesn't support this at all, so we are just wasting 2KB of RAM here.</P><P></P><P>Am I correct in thinking I can remove this, and the&nbsp;m_usb_bdt and m_usb_global sections for both projects that don't use USB and projects that do. My tests suggest that I can indeed do this with no negative repercussions.</P><P></P><P>Thanks</P><P>Andy</P></BODY></HTML> Sat, 13 May 2017 18:23:06 GMT https://community.nxp.com/t5/MCUXpresso-SDK/k66-and-USB-dedicated-RAM/m-p/678583#M177 andrewparlane2 2017-05-13T18:23:06Z Re: k66 and USB dedicated RAM https://community.nxp.com/t5/MCUXpresso-SDK/k66-and-USB-dedicated-RAM/m-p/678584#M178 <HTML><HEAD></HEAD><BODY><P>Hi Andrew:</P><P></P><P>Yes, you are correct, that section can be removed.</P><P>I checked the latest version of KSDK 2.2, this section is not in linker script.</P><P></P><P></P><P>Regards</P><P>Daniel</P></BODY></HTML> Mon, 22 May 2017 07:12:59 GMT https://community.nxp.com/t5/MCUXpresso-SDK/k66-and-USB-dedicated-RAM/m-p/678584#M178 danielchen 2017-05-22T07:12:59Z Re: k66 and USB dedicated RAM https://community.nxp.com/t5/MCUXpresso-SDK/k66-and-USB-dedicated-RAM/m-p/678585#M179 <HTML><HEAD></HEAD><BODY><P>Thanks.</P></BODY></HTML> Thu, 22 Jun 2017 17:59:30 GMT https://community.nxp.com/t5/MCUXpresso-SDK/k66-and-USB-dedicated-RAM/m-p/678585#M179 andrewparlane2 2017-06-22T17:59:30Z