Hi Martin,<br><br>&gt; On the other hand, I have access to very cheap phones using Infineon<br>
&gt; PMB7880 (C166 + DSP) or MTK (ARM9) chipsets.<br><br>Note, that on the market there is much more Mediatek phones based on ARM7 (MT622x) than on ARM9 (MT623x).<br>I mainly focused on MT623x series of Mediatek SoC, which is based on ARM926EJ-S with MMU support.<br>
My Linux port for this architecture didn&#39;t touch L1 at all. I focused first on getting &quot;application&quot; cpu up and running.<br>This went quite well and then I tried to understand how L1 works.<br>Writing driver for MT6140 helped me understand basics of baseband part of the phone.<br>
I managed to configure TX path to transfer data on given frequency and after that I had to have DSP running to send &quot;proper&quot; data. <br>I got stack on DSP part, because I tried first to download firmware from DSP ROM. This didn&#39;t work out so far.<br>
Better approach would be to disassemble and understand DSP-ARM API and use it as it is, without firmware changing for now.<br>Unfortunately I couldn&#39;t find time to work on that due to my professional work.<br>Anyway, all the links are already given in this thread and that&#39;s the current status. I described all my findings on OsmocomBB wiki.<br>
<br>@Wolfram: I&#39;ll probably submit barebox port with update of Mediatek kernel code to 3.2 kernel version.<br><br>BR,<br>Marcin <br><br>