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Thread: Using Latest OzTiVo 1.62 image on UK S1 TiVos

  1. #1
    Join Date
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    Using Latest OzTiVo 1.62 image on UK S1 TiVos

    I've been trying to use the latest OzTiVo (1.6.2 Phillips) image on my UK (Thomson) TiVo. Mostly it works well (certainly better than the time I last tried to set it up 5 or 6 years ago) and the additional features over the UK 2.5.5 image are great. However for me there is still one dealbreaker when it comes to enabling RGB on the SCART inputs.

    Whem you use the TiVo myworld interface to set s-video output it successfully switches to RGB output on the TV scart, which is fine and exactly what I wanted. But when I do similar for the input setting from the set top box, it can't handle the RGB signal coming in very well at all. Either the scart input is not wired for s-video (or more likely my set top box doesn't transmit s-video on the scart) so all I can do is leave it set to composite as the s-video setting renders live TV unusable (Black and White and lots of snow/artifacts despite that I have it in PAL mode). The Composite input setting yields a watchable picture, its still only very mediocre due to the limitations of the composite input itself (lots of colour runs/bleeding, loss of sharp edges, dot crawl, etc.)

    So what I have is a situation where the US image otherwise works perfectly, with all the menus are output nicely in RGB, but the set top box input signal displays in very poor composite quality rather than the RGB format that the UK image supports easily.

    What I suspect I need to do is to somehow force the TiVo to "switch on" RGB input/encoding mode. I suspect that there may be an iicsetw command that will do this on the UK TiVo box, and I've been looking at old threads to undestand how this might work. eg: this old tivocommunity.com thread However many of the old threads on using iicsetw now seem to have been moved or lost and I cant find anything on what the parameters are. (Note that I did consider modifying Palmod_config to do this, but on closer inspection I think it does not actually do any input mode switching - I haven't actually been able to find the place in the code if it does.)

    Has anyone tried to do anything with the iicsetw commands? Particularty around swithcing the input source? Or does anyone have any documentation on the iicsetw commands for the encoder chip, or know how to read the settings from an existing TiVo so that I can determine what they are?
    Last edited by Dave Hatt; 26-01-2010 at 01:32 PM.

  2. #2
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    Do you still want help with this? (I tried the component out mod a while back)

    You'll need to find the part number of the video scaler chip for the UK tivo - probably easiest to open it up and look. For the US version it is SAA7114H, so UK is probably SAA71?? (not SAA7128 - that is for the output video).

  3. #3
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    I haven't quite got it working yet, but yes I have identified that on the UK TiVos the input chip is the Phillips SAA7118E. I have found the datasheet and I believe I have identified the correct register to flip it from S-Video to RGB (02H). I think I have also identified the subregister of the chip (0x42). I just haven't quite worked out how to form the command using iicsetw just yet, in particular how to make it address 0x42, but I've only just started looking at that code and ran out of time. I also wonder that when I flip the mode that there might need to be other registers poked as well, but I guess that will come down to some testing.

    I guess its very similar to the component output mod, except that I looking to adjust the input chip too. What I did notice while looing at the 7118 datasheet was that the chip does Component *input* as well as RGB input. I'm thinking that after I figure out how to get both RGB input and output going, I might try getting both Component input and output going. Given that every modern TV now supports Component in Australia I feel that this will be quite useful to other people. (Certainly on my HD TVs there is a noticable difference from S-Video to Component, which is why I purchased UK TiVos in the first place. I'm sure there would be others who feel the same way.)

  4. #4
    Join Date
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    Cool sounds like your on a plan.

    Don't have a UK TiVo handy to confirm your findings and really rusty on iicset, but if the location is 0x42 and register is 02H then the command would be something like iicset 0x42 0x02 0x?? (?? is the correct value for the register). Doesn't really matter too much if you get it wrong, as iicset does not survive a reboot.

    You may be able to look at current values for the chip using iicdump 0x42 (can't find a copy of iicdump right now though)

    I'm sure a lot of people would appreciate a component input and output option.

    Peter.

    Ps If you get stuck, you may want to pm thompson here, he is the palmod software guru and knows iic programing pretty well.
    Please search this forum and our Website for your TiVo questions before starting a new thread. Thanks!

  5. #5
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    So the sub address appears to be 02h with a value of 110000 binary to put the 7118E chip into what the datasheet describes as MODE5.

    So I figure that the command should be as follows:

    /var/hack/iicsetw 0x42h 0x2h 48

    However this yields precisely no discernable impact that I can see. Now there might be other registers involved (and I have a few suspects) but I figure I must be doing something wrong for it to have no impact whatsoever (and I get the right output from iicsetw to know that it is working in itself).

    btw: One thing I am worried about is that the 7118 likely gets reset on channel changes, and perhaps even more frequently. But I was still expecting to see some sort of change, even if fleeting!

  6. #6
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    Running with an external STB as the active source on UK2.5.5
    Code:
    #iicget 0x42 0x02
    Contents of address 02 is: b1
    which appears to be mode 0x31.

    swapping to the internal tuner changes it
    Code:
    # iicget 0x42 0x02
    Contents of address 02 is: 8f
    i.e. mode 0x0F

    So I'd say that you are on the correct track as far as changing the mode of that IC goes (although you'll want mode 0x31).

    I am happy to dump other register values for you if you need them, although it would appear that it will be a manual process of dumping each register one at a time with iicget! (iicdump wants a linked library that I don't have and just throws the error "BUG IN DYNAMIC LINKER ld.so: dynamic-link.h: 46: elf_get_dynamic_info: Assertion `! "bad dynamic tag"' failed!")

  7. #7
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    Thanks catdog, that was the clue that I was looking for!

    I compared the subaddresses between two TiVos, one running UK image in RGB input and one running the US image. Subaddresses 0x02H, 0x29H and 0x90H seem to be the material differences. They also seem to need to be changed in a set order.

    So far I have been able to get the US OzTiVo image into RBG input mode with the following:

    /var/hack/iicsetw 0x42h 0x90h 0
    /var/hack/iicsetw 0x42h 0x29h 192
    /var/hack/iicsetw 0x42h 0x2h 177
    In my testing I also found that subaddress 0F was different between the two boxes (UK was 37h US was 36h) but somehow this register wont update directly. May not be important, but I'm still looking into it.

    Meanwhile I'm still running some tests to see if I've missed anything else --- the picture quality is a vast improvement but there are still a few artifacts and I am going to check everything again in case I've missed a setting. But I'm not ruling out the artifacts being in the input source though (Foxtel Digital).

    Next step will be to get this automated, and in such a way that survives channel changes!

  8. #8
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    Ok, so I managed to get iicget to dump all of the registers with tivo configured for RGB input.
    Code:
    Contents of address 01 is: 07
    Contents of address 02 is: b1
    Contents of address 03 is: 28
    Contents of address 04 is: 90
    Contents of address 05 is: 90
    Contents of address 06 is: 97
    Contents of address 07 is: e4
    Contents of address 08 is: 18
    Contents of address 09 is: 40
    Contents of address 0a is: 80
    Contents of address 0b is: 48
    Contents of address 0c is: 40
    Contents of address 0d is: 01
    Contents of address 0e is: 01
    Contents of address 0f is: 35
    Contents of address 10 is: fa
    Contents of address 11 is: 00
    Contents of address 12 is: 09
    Contents of address 13 is: 02
    Contents of address 14 is: 10
    Contents of address 15 is: 11
    Contents of address 16 is: 01
    Contents of address 17 is: c2
    Contents of address 18 is: 40
    Contents of address 19 is: 80
    Contents of address 1a is: 00
    Contents of address 1b is: 00
    Contents of address 1c is: 00
    Contents of address 1d is: 00
    Contents of address 1e is: 02
    Contents of address 1f is: 81
    Contents of address 20 is: 00
    Contents of address 21 is: 00
    Contents of address 22 is: 00
    Contents of address 23 is: 00
    Contents of address 24 is: 90
    Contents of address 25 is: 90
    Contents of address 26 is: 00
    Contents of address 27 is: 00
    Contents of address 28 is: 00
    Contents of address 29 is: c0
    Contents of address 2a is: b1
    Contents of address 2b is: 60
    Contents of address 2c is: 5d
    Contents of address 2d is: 00
    Contents of address 2e is: 00
    Contents of address 2f is: 00
    Contents of address 30 is: 00
    Contents of address 31 is: 00
    Contents of address 32 is: 00
    Contents of address 33 is: 00
    Contents of address 34 is: 00
    Contents of address 35 is: 00
    Contents of address 36 is: 00
    Contents of address 37 is: 00
    Contents of address 38 is: 00
    Contents of address 39 is: 00
    Contents of address 3a is: 00
    Contents of address 3b is: 00
    Contents of address 3c is: 00
    Contents of address 3d is: 00
    Contents of address 3e is: 00
    Contents of address 3f is: 00
    Contents of address 40 is: 00
    Contents of address 41 is: ff
    Contents of address 42 is: ff
    Contents of address 43 is: ff
    Contents of address 44 is: 88
    Contents of address 45 is: 88
    Contents of address 46 is: 88
    Contents of address 47 is: 88
    Contents of address 48 is: 88
    Contents of address 49 is: 88
    Contents of address 4a is: 88
    Contents of address 4b is: 88
    Contents of address 4c is: 88
    Contents of address 4d is: 88
    Contents of address 4e is: 88
    Contents of address 4f is: 88
    Contents of address 50 is: 88
    Contents of address 51 is: 88
    Contents of address 52 is: 88
    Contents of address 53 is: 88
    Contents of address 54 is: 88
    Contents of address 55 is: ff
    Contents of address 56 is: 88
    Contents of address 57 is: ff
    Contents of address 58 is: 27
    Contents of address 59 is: 47
    Contents of address 5a is: 03
    Contents of address 5b is: 03
    Contents of address 5c is: 00
    Contents of address 5d is: 3e
    Contents of address 5e is: 0a
    Contents of address 5f is: 00
    Contents of address 60 is: 40
    Contents of address 61 is: 30
    Contents of address 62 is: 7f
    Contents of address 63 is: 00
    Contents of address 64 is: 00
    Contents of address 65 is: 00
    Contents of address 66 is: 00
    Contents of address 67 is: 20
    Contents of address 68 is: 00
    Contents of address 69 is: 00
    Contents of address 6a is: 00
    Contents of address 6b is: 00
    Contents of address 6c is: 00
    Contents of address 6d is: 00
    Contents of address 6e is: 00
    Contents of address 6f is: 00
    Contents of address 70 is: 00
    Contents of address 71 is: 00
    Contents of address 72 is: 00
    Contents of address 73 is: 00
    Contents of address 74 is: 00
    Contents of address 75 is: 00
    Contents of address 76 is: 00
    Contents of address 77 is: 00
    Contents of address 78 is: 00
    Contents of address 79 is: 00
    Contents of address 7a is: 00
    Contents of address 7b is: 00
    Contents of address 7c is: 00
    Contents of address 7d is: 00
    Contents of address 7e is: 00
    Contents of address 7f is: 00
    Contents of address 80 is: 10
    Contents of address 81 is: 00
    Contents of address 82 is: 00
    Contents of address 83 is: 01
    Contents of address 84 is: a0
    Contents of address 85 is: 01
    Contents of address 86 is: c0
    Contents of address 87 is: 01
    Contents of address 88 is: e8
    Contents of address 89 is: 00
    Contents of address 8a is: 00
    Contents of address 8b is: 00
    Contents of address 8c is: 00
    Contents of address 8d is: 00
    Contents of address 8e is: 00
    Contents of address 8f is: f3
    Contents of address 90 is: 40
    Contents of address 91 is: 08
    Contents of address 92 is: 00
    Contents of address 93 is: 00
    Contents of address 94 is: 00
    Contents of address 95 is: 00
    Contents of address 96 is: d0
    Contents of address 97 is: 02
    Contents of address 98 is: 16
    Contents of address 99 is: 00
    Contents of address 9a is: 22
    Contents of address 9b is: 01
    Contents of address 9c is: 20
    Contents of address 9d is: 02
    Contents of address 9e is: 20
    Contents of address 9f is: 01
    Contents of address a0 is: 01
    Contents of address a1 is: 00
    Contents of address a2 is: 00
    Contents of address a3 is: 00
    Contents of address a4 is: 80
    Contents of address a5 is: 40
    Contents of address a6 is: 40
    Contents of address a7 is: 00
    Contents of address a8 is: 4b
    Contents of address a9 is: 05
    Contents of address aa is: 00
    Contents of address ab is: 00
    Contents of address ac is: a5
    Contents of address ad is: 02
    Contents of address ae is: 00
    Contents of address af is: 00
    Contents of address b0 is: 00
    Contents of address b1 is: 04
    Contents of address b2 is: 00
    Contents of address b3 is: 04
    Contents of address b4 is: 01
    Contents of address b5 is: 00
    Contents of address b6 is: 00
    Contents of address b7 is: 00
    Contents of address b8 is: 00
    Contents of address b9 is: 00
    Contents of address ba is: 00
    Contents of address bb is: 00
    Contents of address bc is: 00
    Contents of address bd is: 00
    Contents of address be is: 00
    Contents of address bf is: 00
    Contents of address c0 is: 00
    Contents of address c1 is: 08
    Contents of address c2 is: 00
    Contents of address c3 is: 00
    Contents of address c4 is: 10
    Contents of address c5 is: 00
    Contents of address c6 is: d0
    Contents of address c7 is: 02
    Contents of address c8 is: 00
    Contents of address c9 is: 00
    Contents of address ca is: 22
    Contents of address cb is: 01
    Contents of address cc is: d0
    Contents of address cd is: 02
    Contents of address ce is: 20
    Contents of address cf is: 01
    Contents of address d0 is: 01
    Contents of address d1 is: 00
    Contents of address d2 is: 00
    Contents of address d3 is: 00
    Contents of address d4 is: 80
    Contents of address d5 is: 40
    Contents of address d6 is: 40
    Contents of address d7 is: 00
    Contents of address d8 is: 00
    Contents of address d9 is: 04
    Contents of address da is: 00
    Contents of address db is: 00
    Contents of address dc is: 00
    Contents of address dd is: 02
    Contents of address de is: 00
    Contents of address df is: 00
    Contents of address e0 is: 00
    Contents of address e1 is: 04
    Contents of address e2 is: 00
    Contents of address e3 is: 04
    Contents of address e4 is: 01
    Contents of address e5 is: 00
    Contents of address e6 is: 00
    Contents of address e7 is: 00
    Contents of address e8 is: 00
    Contents of address e9 is: 00
    Contents of address ea is: 00
    Contents of address eb is: 00
    Contents of address ec is: 00
    Contents of address ed is: 00
    Contents of address ee is: 00
    Contents of address ef is: 00
    Dont worry about the value for address 0x0F - the datasheet says it is the chrominance gain, but it is configured as automatic (so you are just reading the current value that it has automatically set).

  9. #9
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    Wow, that saved me a lot of time to dump them all myself! Did you write a TCL script or similar to automate the process, or just do them one at a time manually with iicget?

    I'm now going to go through and check these against the 3.0 register values on the OzTiVo 1.6.2 image and then investigate the differences from there. If you had any script that could speed up the iicget process that would help!

    When I get the definitive list of changes I will be having a look at where to put them to make them permanent (I'm thinking palmod_config?).

  10. #10
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    I dont think I'd ever have the patience to do them all manually. Here is the TCL script I used
    Code:
    !/tvbin/tivosh
    
    for { set i 1 } { $i <= 239 } { incr i } {
    
    set res [exec iicget 0x42 $i]
    puts $res
    
    }
    Regarding how to make the changes permanent, I don't think palmod is used if you are running a UK tivo (although I could be wrong). Following another recent thread, I think it uses UKchan30.o instead. I guess if that is the case, you could make the changes there and recompile.

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