Revision as of 12:56, 12 November 2011

The Western Digital TV Live is a media player running a Sigma Designs SMP8655 (Non Macrovision version of the SMP8654).

It sports three processors, a 500MHz MIPS 24KF main CPU+FPU, a 333MHz MIPS 4KEc IPU (Image Processing Unit) and a 333MHz Security CPU supporting conditional access (CA) and digital rights management (DRM).

~ # cat /proc/cpuinfo
system type  : Sigma Designs TangoX
processor  : 0
cpu model  : MIPS 24K V7.12 FPU V0.0
Initial BogoMIPS  : 332.59
wait instruction  : yes
microsecond timers  : yes
tlb_entries  : 32
extra interrupt vector  : yes
hardware watchpoint  : yes
ASEs implemented  : mips16
shadow register sets  : 1
VCED exceptions  : not available
VCEI exceptions  : not available

System bus frequency  : 333000000 Hz
CPU frequency  : 499500000 Hz
DSP frequency  : 333000000 Hz


The board uses MIPS's YAMON PROM Monitor as the bootloader. Source code is available from here.

To break into the YAMON console while booting, press the 0 key.

/proc # cat sigminfo dev: size offset name CS sigmblk0: 0ff80000 00000000 "CS0-Device" 0
sigmblk1: 00080000 00000000 "CS0-Part1" 0
sigmblk2: 00040000 00080000 "CS0-Part2" 0
sigmblk3: 00300000 000c0000 "CS0-Part3" 0
sigmblk4: 00300000 003c0000 "CS0-Part4" 0
sigmblk5: 01000000 006c0000 "CS0-Part5" 0
sigmblk6: 00800000 016c0000 "CS0-Part6" 0
sigmblk7: 05a00000 01ec0000 "CS0-Part7" 0
sigmblk8: 05a00000 078c0000 "CS0-Part8" 0
sigmblk9: 00020000 0d2c0000 "CS0-Part9" 0
sigmblk10: 00020000 0d2e0000 "CS0-Part10" 0
sigmblk11: 00020000 0d300000 "CS0-Part11" 0


/dev # ls -l /dev/mtd* brw-r--r-- 1 root root 254, 0 Jan 1 2000 /dev/mtdblock0 brw-r--r-- 1 root root 254, 3 Jan 1 2000 /dev/mtdblock2 brw-r--r-- 1 root root 254, 6 Jan 1 2000 /dev/mtdblock3 lrwxrwxrwx 1 root root 15 Jan 1 2000 /dev/mtdblock_bootloader -> /dev/sigmblocka lrwxrwxrwx 1 root root 15 Jan 1 2000 /dev/mtdblock_kernel -> /dev/sigmblockd lrwxrwxrwx 1 root root 15 Jan 1 2000 /dev/mtdblock_romfs -> /dev/sigmblockh

ls -l /dev/sigmblock* brw-rw---- 1 root root 254, 0 Jan 1 2000 /dev/sigmblocka brw-rw---- 1 root root 254, 1 Jan 1 2000 /dev/sigmblockb brw-rw---- 1 root root 254, 2 Jan 1 2000 /dev/sigmblockc brw-rw---- 1 root root 254, 3 Jan 1 2000 /dev/sigmblockd brw-rw---- 1 root root 254, 4 Jan 1 2000 /dev/sigmblocke brw-rw---- 1 root root 254, 5 Jan 1 2000 /dev/sigmblockf brw-rw---- 1 root root 254, 6 Jan 1 2000 /dev/sigmblockg brw-rw---- 1 root root 254, 7 Jan 1 2000 /dev/sigmblockh brw-rw---- 1 root root 254, 8 Jan 1 2000 /dev/sigmblocki brw-rw---- 1 root root 254, 9 Jan 1 2000 /dev/sigmblockj brw-rw---- 1 root root 254, 10 Nov 12 12:51 /dev/sigmblockk brw-rw---- 1 root root 254, 11 Jan 1 2000 /dev/sigmblockl

sigmblocka signblockc YAMON sigmblockd vmlinux_xload.zbf sigmblocke vmlinux_xload.zbf sigmblockh

sigmblockf Splash Screens