Inside the MPIO HD300

Firmware upgrade

To upgrade the firmware from a Linux box (or from a windows box for that matter), download the .zip file from the mpio website and copy all of the extracted files into the "SYSTEM" directory on your player. Disconnect the player and turn the power on with the AC adapter plugged in. It will go through its upgrade routine and then shut off. Turn the power on again and it will do the upgrade routine once more. The third time you turn it on, you should see the new version number on the splash screen and the player should be good to go! - source, official site information with screenshots for Windows

Docs

Here is the documentation for the IC's used:

• SCF5249PB Coldfire CPU
• Wolfson WM8750L codec
• S71145 Multi-purpose flash
• MK2004-4004 1.8" Toshiba HDD
• LM 339 Quad voltage comparator
• GL811E USB2.0 ATA/ATAPI Bridge controller
• 93c46 1024-bit Serial CMOS EEPROM
• TEA5767/68 Single chip FM Stereo radio
• Seiko S-35380A RTC
• 160x128 2-bit greyscale LCD (probably S1D15E06? controller - the same as in Iriver H1x0)

Source

Official links

• MPIO HD300 page
• MPIO HD300 FAQ

Disassembly pics

Taken from the above site, I hope they are correct and useful

Rockbox port feasibility study

Many (if not all) drivers are written already and needs to be only slightly tweaked:

1. CPU fully supported (irivers, iaudios, mpio hd200)
2. Disk access routines as in HD200
3. LCD routines as in Iaudio M5
4. Backlight as in HD200
5. Battery charging as in HD200
6. Battery reading (aka ADC) as in HD200
7. I2C? uses standard coldfire module
8. I2S? uses standard coldfire module
9. Codec as in HD200
10. Keys use mix of synaptic MEP touchstrip and hardware buttons (GPIOs)
11. USB bridge as in HD200
12. RTC can use code from rtc_s35390a.c (maybe slightly tweaked)

There are probably some differences in GPIOs assignment compared to HD200.

OF disassembly discoveries

Key handling

GPIO56 - PLAY (active high) GPIO41 - MENU (active low) GPIO45 - ENTER (active low) GPIO51 - HOLD (active low)

ADC1 redouts: NEXT - 250-450 PREV - 600-800 REC - 950-1150

GPIO6 and GPIO7 are used to somehow communicate with synaptics module.

The 8 pin ZIF connector used to connect Synaptics module has pinout as follows:

1. VDD_IO
2. GPIO6
3. GPIO7
4. GPI41
5. GPIO45
6. GPIO31
7. GND
8. GND