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<p class="MsoNormal">I have created a RAM disk on Zynq RTEMS and I’d like to set up (for the time being) a ‘baremetal ‘ type DMA transferTo the ramdisk .
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have set up the RAM Disk as follows, and have no problem reading or writing to it. How do I find the physical address in memory where the
<o:p></o:p></p>
<p class="MsoNormal">RAM Disk has been created? I think I may be better off allocating a static memory region for this; my RAMDISK size is 384Mbytes<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:#005032">rtems_status_code</span><span style="font-size:10.0pt;font-family:Consolas;color:black">
<b>create_ramdisk</b>(</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span><b><span style="font-size:10.0pt;font-family:Consolas;color:#7F0055">const</span></b><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span><b><span style="font-size:10.0pt;font-family:Consolas;color:#7F0055">char</span></b><span style="font-size:10.0pt;font-family:Consolas;color:black"> *device,</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span><span style="font-size:10.0pt;font-family:Consolas;color:#005032">uint32_t</span><span style="font-size:10.0pt;font-family:Consolas;color:black"> media_block_size,</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span><span style="font-size:10.0pt;font-family:Consolas;color:#005032">rtems_blkdev_bnum</span><span style="font-size:10.0pt;font-family:Consolas;color:black"> media_block_count</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">)</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">{</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span><span style="font-size:10.0pt;font-family:Consolas;color:#005032">rtems_status_code</span><span style="font-size:10.0pt;font-family:Consolas;color:black"> sc;</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span><span style="font-size:10.0pt;font-family:Consolas;color:#005032">ramdisk</span><span style="font-size:10.0pt;font-family:Consolas;color:black"> *rd;</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> rd =
</span><b><span style="font-size:10.0pt;font-family:Consolas;color:#642880">ramdisk_allocate</span></b><span style="font-size:10.0pt;font-family:Consolas;color:black">(NULL, media_block_size, media_block_count, false);</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span><b><span style="font-size:10.0pt;font-family:Consolas;color:#7F0055">if</span></b><span style="font-size:10.0pt;font-family:Consolas;color:black"> (rd != NULL) {</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> sc =
</span><b><span style="font-size:10.0pt;font-family:Consolas;color:#642880">rtems_blkdev_create</span></b><span style="font-size:10.0pt;font-family:Consolas;color:black">(</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> device,</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> media_block_size,</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> media_block_count,</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black">
</span><b><span style="font-size:10.0pt;font-family:Consolas;color:#642880">ramdisk_ioctl</span></b><span style="font-size:10.0pt;font-family:Consolas;color:black">,</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> rd</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> );</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> }
</span><b><span style="font-size:10.0pt;font-family:Consolas;color:#7F0055">else</span></b><span style="font-size:10.0pt;font-family:Consolas;color:black"> {</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Consolas;color:black"> sc =
</span><i><span style="font-size:10.0pt;font-family:Consolas;color:#0000C0">RTEMS_UNSATISFIED</span></i><span style="font-size:10.0pt;font-family:Consolas;color:black">;</span><span style="font-size:10.0pt;font-family:Consolas"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:Consolas;color:black"> }</span><o:p></o:p></p>
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