github.com/f-secure-foundry/tamago@v0.0.0-20220307101044-d73fcdd7f11b/board/f-secure/usbarmory/mark-two/mem.go (about)

     1  // USB armory Mk II support for tamago/arm
     2  // https://github.com/f-secure-foundry/tamago
     3  //
     4  // Copyright (c) F-Secure Corporation
     5  // https://foundry.f-secure.com
     6  //
     7  // Use of this source code is governed by the license
     8  // that can be found in the LICENSE file.
     9  
    10  // +build !linkramsize
    11  
    12  package usbarmory
    13  
    14  import (
    15  	_ "unsafe"
    16  )
    17  
    18  // Applications can override ramSize with the `linkramsize` build tag.
    19  //
    20  // This is useful when large DMA descriptors are required to re-initialize
    21  // tamago `mem` package in external RAM.
    22  
    23  // The standard USB armory Mk II features a single 512MB DDR3 RAM module.
    24  
    25  //go:linkname ramSize runtime.ramSize
    26  var ramSize uint32 = 0x20000000 // 512 MB