Sansa M200 Port

Intro

Hmm, so I'm looking to port Rockbox to the Sansa m200 series, m240 specifically. I've attached a couple scans, and here's the info that has been collected variously.

Current Status

Some initial work has been committed to SVN on 2 May 2008. It is possible to compile a build, but not much else. There is an working tick interrupt in the bootloader and a working LCD driver, but a working ATA (NAND) driver is still needed.

NOTE: This port is only for the v1 m200.

Firmware

If you get the binary upgrade executable from SanDisk (http://www.sandisk.com/Retail/Default.aspx?CatID=1326) and run it under windows, it'll store the SANSM200.rom file in C:\Windows\temp even though it fails to install it.

It seems to be plain and unencrypted. The header includes data (like Ver:0071 ) that is also found in other TeleChip based firmwares, see http://www.rockbox.org/mail/archive/rockbox-dev-archive-2007-07/0077.shtml

Info that I've gleaned

(was under a black spongy pad) ESMT M12313161A- LXY1F80FJ

10T 0634

SANSA M200+ V4.1 25-1587-G02V--K

SanDisk 20-99-00112-2 S637-691002 SDC1 TAIWAN

SJK 24.000

CF628

TEA5767 CF8556 01 TPG06292

The front doesn't have much interesting, The white lettering is: GFM01 92VO^ 0643

Button thing (?): 4R7 2U

VBAT is next to that.

Other info below is just gleaned, an I can't vouch for its correctness or anything.

MaxKelley's info

OK, I connected my Sansa m240 in MSC mode, here's fdisk -l:

Code:

Disk /dev/sda: 1016 MB, 1016856576 bytes
32 heads, 61 sectors/track, 1017 cylinders
Units = cylinders of 1952 * 512 = 999424 bytes

   Device Boot      Start         End      Blocks   Id  System

Are there any flags that will show hidden partitions or something? Also, there are two hardware revisions of this player that I have seen. One hardware revision is revision 4, the other is 1.30. The usb id's of these two are 0781:7431, and 0781:7401, respectively. I did the above fdisk listing using a revision 4 model, which has an improved (brighter) backlight and graphics (some fonts are different as well) over the revision 1.30. There are isn't really a way to tell which is which, having them side-by-side.

Code:

[18957561.368000] usb 5-7: new high speed USB device using ehci_hcd and address 25
[18957561.508000] usb 5-7: configuration #1 chosen from 1 choice
[18957561.512000] scsi20 : SCSI emulation for USB Mass Storage devices
[18957561.512000] usb-storage: device found at 25
[18957561.512000] usb-storage: waiting for device to settle before scanning
[18957566.516000] usb-storage: device scan complete
[18957566.520000]   Vendor: SanDisk   Model: Sansa m240        Rev: v4.0
[18957566.520000]   Type:   Direct-Access                      ANSI SCSI revision: 00
[18957566.544000] SCSI device sda: 1986048 512-byte hdwr sectors (1017 MB)
[18957566.544000] sda: Write Protect is off
[18957566.544000] sda: Mode Sense: 04 00 00 00
[18957566.544000] sda: assuming drive cache: write through
[18957566.564000] SCSI device sda: 1986048 512-byte hdwr sectors (1017 MB)
[18957566.564000] sda: Write Protect is off
[18957566.564000] sda: Mode Sense: 04 00 00 00
[18957566.564000] sda: assuming drive cache: write through
[18957566.564000]  sda:
[18957566.568000] sd 20:0:0:0: Attached scsi removable disk sda
[18957566.568000] sd 20:0:0:0: Attached scsi generic sg0 type 0
[18957567.968000] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!

Strange thing about it is that it runs firmware version 4.0.44A, where the latest on the SanDisk site is something like 3.0.2, where my 1.30 runs 3.2.8A. SanDisk needs to fix their firmware updates.. I hope this helps somewhat. Edit: Ok, here's a longer lsusb with -v:

Code:

Bus 005 Device 026: ID 0781:7431 <nop>SanDisk Corp. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x0781 <nop>SanDisk Corp.
  idProduct          0x7431 
  bcdDevice            4.0e
  iManufacturer           1 SanDisk
  iProduct                2 SanDisk Sansa m240
  iSerial                 3 4014E30F0117B3930000000000000000
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          4 config1: Mass Storage only
    bmAttributes         0xc0
      Self Powered
    !MaxPower                0mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         8 Mass Storage
      bInterfaceSubClass      6 SCSI
      bInterfaceProtocol     80 Bulk (Zip)
      iInterface              5 ms ifac 1 (SCSI::BULK_ONLY)
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x01  EP 1 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0200  1x 512 bytes
        bInterval               0
Device Qualifier (for other device speed):
  bLength                10
  bDescriptorType         6
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  bNumConfigurations      1
Device Status:     0x0001
  Self Powered

Edit some more: Ok, here's some more help. I got the roms from the firmware update, not sure if this will help:

• American Version: http://max.craplandia.org/sansaroms/SANSM200_American.rom
• Asian Version: http://max.craplandia.org/sansaroms/SANSM200_Asian.rom
• European Version: http://max.craplandia.org/sansaroms/SANSM200_European.rom

Info from the AnythingButIpod forums, via AlexHayes89

I cracked my M250 open to see what hardware is used:

Main processor/"System on Chip" (SOC): Telechips TCC 770

http://www.telechips.com

Couldn't get any detailed info, their website requires a logon just to see the datasheet. Possibly because they are in the process of being sued by SigmaTel for patent infringement. I emailed asking how to get a software developer's kit, but don't expect an answer. They are not set up to sell product into the USA. Anyone have a friend in Hong Kong that would front for me in getting one ? Anyway, here's the info I COULD find:

TCC77x Series are system LSI for digital audio player based on the ARM946E-S, ARM'sproprietary 32-bit RISC CPU core. It can decode and encode MP3 or other types of audio/voice compression/ decompression standards by software based architechure. The on-chip USB 2.0 compliant controller enables the data transmission between a personal computer and storage device such as NAND flash, HDD, SD,MMC etc.

Applications

• Portable MP3 player (WMDRM10)
• Mobile MP3 phone
• Juke Box (Audio & Photo)
• Portable MP3 Karaoke
• Digital Internet Radio Server
• Electronic Dictionary
• Personal Multimedia Player (Audio/Image/Video)
• Multimedia Storage Device

SDK

• Provides Reference Solution including H/W and S/W
• Provides World-first proven JANUS DRM(WMDRM 10 - PD) Solution
• Supports various Audio & Video codec
• MP3 decoding/encoding
• SoundCodecWMA decoding/encoding
• OGG decoding
• ADPCM decoding/encoding
• JPEG decoding
• MPEG4-SP decoding
• Supports MSC (Mass Storage Class) & MTP (Media Transfer Protocol)
• Supports Meta-data Browsing

Features

• ARM946E-S CPU core (4KB cache, up to 120MHz), 0.13um process
• Core : 1.1V ~ 1.3V, I/O : 1.8V ~ 3.3V
• 4K bytes of internal boot ROM with various boot procedure (NAND, UART, USB, EHI) and security
• 64K bytes of internal SRAM for general usage
• 4K bytes of data TCM (Tightly Coupled Memory) for fast data access

On-chip peripherals

• USB2.0 Device / USB1.1 Host
• ECC generator for SLC and MLC NAND Flash
• General purpose 8 channel 10-bit ADC
• RTC (Real Time Clock) for battery backup
• EHI (External Host Interface) for parallel host interface
• Dedicated Memory Interfaces: SD ,MMC, SLC / MLC NAND Flash , IDE I/F for HDD
• Embedded 8Mbit Nor Flash ,16Mbit SDRAM, High Performance Audio Codec Options

Other parts

TI TLV320AIC23B Stereo codec and headphone amp (not sure why this is needed, as the telechips supposedly has the codec built in? Maybe just for the headphone amp)

ESMT M12S16161A 1M X 16 DRAM

Flash is Samsung... I didn't bother with the chip IDs

Philips TEA5767 FM radio - comment by MarianneArnold: this chip is used in a few other rockbox targets as well (Iriver H1x0s, Iriver H3x0s, newer Archos Ondios; present in the Iriver H10s as well but not yet supported there)

and a couple I was unable to track down from the markings:

59TI AIP

and

AZ-76 VOB

..... and, yes, I got it back together and working perfectly

Other stuff / Attached Scans

Attachment	Action	Size	Date	Who	Comment
scan0003.jpg	manage	3198.5 K	09 Jul 2007 - 01:27	JoelBradshaw	The front of the Sansa m240 PCB
m240back.jpg	manage	3127.2 K	09 Jul 2007 - 01:45	JoelBradshaw	The back of the Sansa m240 PCB
m240front_(Small).jpg	manage	16.3 K	09 Jul 2007 - 01:46	JoelBradshaw	Thumbnail of the front of the Sansa m240 PCB
m240back_(Small).jpg	manage	16.2 K	09 Jul 2007 - 01:49	JoelBradshaw	Thumbnail of the back of the Sansa m240 PCB