DVB-T Set top box with MSD7818?

[BonePit685]

I found an old set top box with what i assume is the MSD 7818. I got into U-boot (output attached below).
The firmware files can be downloaded from here, mine is the WIWA HD-80 evo:
https://www.gutek.com.pl/softy.htm

BOOTSPILMLMLMLM7696_OK!decomp
_done

Hello U-Boot


U-Boot 1.1.6 (Dec 21 2015 - 11:19:34)

Board: MSTAR KAPPA (CPU Speed 600 MHz)
DRAM:  64 X 0 MBytes
U-Boot is running at DRAM 0x87610000
Module: USB FAT FLASH SPI LOGO OSD ENV=SERIAL 
Flash is detected (0x0C02, 0xC8, 0x40, 0x16)
In:    serial
Out:   serial
Err:   serial
MSVC00B000100100208768TH0000000T
[MDrv_PNL_Init][524] 
MDrv_PNL_Init u32PnlRiuBaseAddr = BF200000
[MDrv_PNL_Init][535] 
MDrv_PNL_Init u32PMRiuBaseAddr = BF000000
[MDrv_PNL_Init][545] 
[MApi_PNL_Init][1118]
[_SetPanelParams][469] 
[MDrv_PNL_SetPanelType][553] 
[MDrv_PNL_SetPanelType][575] 
[_MDrv_PNL_Init_LPLL][295]pstPanelInitData->u16Width=1920, pstPanelInitData->u16Height=1080
[_MDrv_PNL_Init_LPLL][297]u16HTotal=2640,u16VTotal=1125,pstPanelInitData->u16HTotal=2640,pstPanelInitData->u16VTotal=1125, u16DefaultVFreq=500
[_MDrv_PNL_Init_Output_Dclk][340]pstPanelInitData->u16Width=1920, pstPanelInitData->u16Height=1080
[_MDrv_PNL_Init_Output_Dclk][342]u16HTotal=2640,u16VTotal=1125,pstPanelInitData->u16HTotal=2640,pstPanelInitData->u16VTotal=1125, u16DefaultVFreq=500
[XC,Version] 00442327
 UTOPIA ASSERT: 0 /home/stb/PERFORCE/THEALE/utopia/project/kappa_nos_mips_mboot/../../mxlib/hal/kappa/xc/mhal_sc.c Hal_SC_set_ficlk 224
DAC eTiming =8
HDMITx eTiming =12
HDMITx eTiming =12
[Hal_VE_EnableDI][1049] bEnable = 0, bIsDNR2VE = 0
u32ReadBuffVirAddr = A0000000, u32IntBuffVirAddr = A0100000, u32OutBuffVirAddr = A0730000
verJPD_SetStatus >>>>>>>>>>> w:720,  h:576,  p:720

[GOP3, PID 0][Driver Version]: 0089, BuildNum: 0002, ChangeList: 00524916
 keypad_pressed is [0] 
 ir_pressed is [0] 
Hit any key to stop autoboot:  0 

<< MStar >># printenv
bootdelay=0
baudrate=115200
preboot=echo;echo Type "help" for more commands.
MS_BOARD=BD_MST173A_D01A
logo_cmd=boot_logo 0 0 1 1
info_exchange=spi
AP_SW_VERSION=0x0001
HW_MODEL=0x0001
HW_VERSION=0x0001
skip_standby=0
OAD_NEED_SCAN=0
USBUpdateFlag=0
usb_upgrade_port=0
partno=1
usb_upgrade_path=usb_upgrade_all_flash.bin
filesize=3002F8
usb_upgrade=0
bootcmd=spi_rdc 0x80b00000 0x7001c 0x28f2d8; LzmaDec 0x80b00000 0x28f2d8 0x80000180 0x81000000; go 0x80000224;
usb_complete=0
OAD_IN_MBOOT=1
CUSTOMER_OUI=0x4C5427
AP_SW_MODEL=0x0012
panel_cmd=set_paneltype 17
OAD_NEED_UPGRADE=1
OAD_FREQ=479000
OAD_BAND=8
OAD_PID=1260
oad_complete=0
OAD_TRIGGER_TYPE=0
AP_OSD_LANG=1
TIMER_AFTER_OAD=758001603
stdin=serial
stdout=serial
stderr=serial

Environment size: 733/65532 bytes
<< MStar >># 

Photos of the device:

I read the "adding a new chip", however it seems to crash the device:

<< MStar >># md.w 0x1f003c00
1F003C00:
Exception: 10
RI: Instruction code not recognized (or not legal)
  $zero: 00000000  $at: 00000000  $v0: 00000002  $v1: 00000080
  $a0: 00000004  $a1: BF200000  $a2: 00000001  $a3: 00000000
  $t0: 00000003  $t1: 00000001  $t2: 00000003  $t3: 00000002
  $t4: 00000020  $t5: 876AF188  $t6: BF2033D4  $t7: BF203398
  $s0: 00000002  $s1: 00000002  $s2: 877791D8  $s3: 1F003C00
  $s4: 00000010  $s5: 877791D8  $s6: 877791D8  $s7: 8762AFC4
  $t8: 876FE7A0  $t9: 87634CBC  $k0: 74796220  $k1: 000A7365
  $gp: 876D8960  $sp: 877791C8  $fp: 877791D8  $ra: 8761BE34
   sr: 34008C02   pc: 8761BE9C  cause : 10000028  badvr : 000000C0

stack backtrace
stack frame #0: ra = 8761BE34, sp = 877791C8
stack frame #1: ra = 87612074, sp = 87779218

I do not have much knowledge about these kinds of things.
Where do i go on from here? Please tell me what I can provide.

[Error1429]

It's possible to run Linux on these set top boxes. See this: #73

[BonePit685]

Thanks for the info! I'll try that when I have some time and report back

[Error1429]

Have fun!