github.com/usbarmory/tamago@v0.0.0-20240508072735-8612bbe1e454/board/raspberrypi/pi1/mem.go (about)

     1  // Raspberry Pi 1 support for tamago/arm
     2  // https://github.com/usbarmory/tamago
     3  //
     4  // Copyright (c) the pi1 package authors
     5  //
     6  // Use of this source code is governed by the license
     7  // that can be found in the LICENSE file.
     8  
     9  //go:build !linkramsize
    10  // +build !linkramsize
    11  
    12  package pi1
    13  
    14  import (
    15  	_ "unsafe"
    16  )
    17  
    18  //go:linkname ramSize runtime.ramSize
    19  
    20  // the following models have 256 MB RAM:
    21  // - model A  (all)
    22  // - model A+ (before 10th August 2016)
    23  // - model B  (before 15th October 2012)
    24  // var ramSize uint32 = 0x10000000 - 0x04000000 // 256 MB - 64MB GPU (VideoCore)
    25  
    26  // the following models have 512 MB RAM:
    27  // - model A+ (after 10th August 2016)
    28  // - model B  (after 15th October 2012)
    29  // - model B+ (all)
    30  var ramSize uint32 = 0x20000000 - 0x04000000 // 512 MB - 64MB GPU (VideoCore)