Rockbox Project (M6)

kgb2008 · 03-10-2008

Quote:

Originally Posted by markun

kgb2008: thanks man, I added the registeres to the page. Are you planning on creating an account for the rockbox wiki or will you keep posting your info here?

I prefer to stay here for a while. Some new findings:
1) 0x3CE00000 is the ADC block, where we get the touch panel reading.
2) 0x3CF00000 is the GPIO block, we can config the I/O pins and get the state of buttons from here.
3) 0x38200000 is the MIU(Memory Interface Unit), it's used for remapping the SRAM and SDRAM, set the refresh timing......
4) 0x39C00000 is the ICU(Interupt Control Unit) which controls the mask/priority/pend bit of various interupt sources.
5) 0x3C800000 is the watchdog, it's been disabled by write a 0x00A5 value!
6) 0x3C700000 should be the TIMER registers block.
7) 0x3C200000 is the NAND Flash Controller.

In the last quarter of the firmware image, there're a lot of data tables and codes which will be copy into the SRAM segment(0x22000000) for the CalmADM DSP to run and do the decode job, I wonder if we should notice this for the ARM940T is not strong enough to work alone.

vcf · 03-10-2008

kgb2008 good work! hm i dont know about if the ARM940T is not strong enough to work alone....

markun · 03-10-2008

200MHz ARM940T is more than enough for a decent audio player (the ipods up till 5.5g ipod video have a dual core 80MHz ARM7), but the CalmADM DSP is more optimized for audio and video decoding.

I thought that maybe the I2S was only available to the DSP (like it is for the TI TMS320DM320) but it looks like it's directly available at 0x3CA00000. kgb2008, can you confirm this?

kgb2008 · 03-10-2008

Quote:

Originally Posted by markun

200MHz ARM940T is more than enough for a decent audio player (the ipods up till 5.5g ipod video have a dual core 80MHz ARM7), but the CalmADM DSP is more optimized for audio and video decoding.

I thought that maybe the I2S was only available to the DSP (like it is for the TI TMS320DM320) but it looks like it's directly available at 0x3CA00000. kgb2008, can you confirm this?

Yes, you're right, If no need to concern about the battery life, and use the device as a pure music player, the arm core can get the job done.

0x3CA00000 is an I2S unit, but I don't know if it's double way or just for input only.

sotux · 03-10-2008

I want to say about the screen display.
Did anybody try to play a 240x320 video on M6? It will play more smoothly by this resolution than play a 320x240 video. Because M6 uses a mobile phone screen and it's physical resolution is 240x320.
In Chinese forum some users mentioned that the firmware makes coordinate transform when displaying. But if you play a 240x320 video, the transform step will be skiped.

roelandb · 03-10-2008

yes, we know this, thats wy batman and other converters automatically rotate the image 90degrees by default,
but i fail to see what this has got to do with rockbox for m6....

parena · 03-10-2008

I think he meant power consumption. Or posted in the wrong forum/thread.

markun · 03-11-2008

sotux: thanks, I didn't know that the screen was in fact a 240x320 screen (like the Gigabeats we support). Does anyone have more info on the LCD modules? I would like to know which LCD driver IC's are used.

kgb2008: on the Gigabeat, the screen is initialised over SPI, do you know how it's done in the Meizu firmware? Do you know at which address the SPI block is located?

Cryonic90 · 03-11-2008

This would be very nice if this all would work. I would love to try rockbox on my M6

roelandb · 03-11-2008

i think rockbox will have a lot of meizu fans soon, since a lot of us seem to be interested to have their original firmware exchanged by rockbox, or if possible the best parts of both (video playback in rockbox is not as good i think)