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RaTTuS
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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 4:28 pm

hippy - power ?
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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 4:31 pm

If you read the info I reposted from Dom on the kodi forums, he reveals that the foundry is now producing a greater percentage of BCM2835's which are 1GHz capable, so much so that the percentage which fail when they test them at 1GHz is so low that they can afford to reject them. So all recent 2835's are guaranteed to run at 1GHz, whereas YMMV with older ones.

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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 4:55 pm

@ rattus : Same PSU as used for a year; 3A I think, good enough to drive my HDD without a powered hub though HDD not connected at present.

@ gregeric : Yes saw that. From jamesh's comments about "last few years" and most run at 1GHz, I thought there'd be a very good chance my B+ would work. Perhaps I'm just unlucky.

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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 6:17 pm

hippy wrote: It looks to me that the issue is something to do with USB but not sure what. Using same hub / keyboard / mouse I have always used, nothing else connected to USB, on a wired LAN.

So, if the settings are reliable for a Pi Zero and the SoC silicon has not changed, is it having the USB/LAN chip on the B+ the problem or could it be something else ?
Two possibilities.
One: The SoC silicon you have is not capable of 1GHz. You might want to compare your ring osc value with others. It's not absolute, but generally high ring osc values correspond to fast silicon and low ring osc values correspond to slow silicon.
Two: The extra load on the power supply is causing a voltage droop. A better power supply may fix this. Note: you'll need to measure the voltage to be sure. The "3A" number written on a supply means very little.

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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 6:36 pm

gregeric wrote:If you read the info I reposted from Dom on the kodi forums, he reveals that the foundry is now producing a greater percentage of BCM2835's which are 1GHz capable, so much so that the percentage which fail when they test them at 1GHz is so low that they can afford to reject them. So all recent 2835's are guaranteed to run at 1GHz, whereas YMMV with older ones.
So they are pre-selecting them.

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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 6:44 pm

Well yes & no. I can only surmise that previously they tested parts @ 700MHz & had adequate yields; now the parts are consistently coming out with faster silicon such that they can test @ 1000Mhz and get adequate yields. So it's not like they are cherry picking 2835's for the Zero. (At least that's my interpretation of what Dom posted).

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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 6:51 pm

gordon77 wrote: So they are pre-selecting them.
They have moved the test goalposts. Every chip manufacturer tests, because yields are not 100% (even for the old 700MHz clock). This testing is usually done before the silicon wafer is cut and packaged. What is new, is that the higher test clock does not lead to an unacceptably low yield (AIUI information on yields at 1Ghz test clock was previously unavailable). I doubt that they "selectively bin" (that is, test at two different clock rates, and keep the devices that only pass at a lower clock for the A+/B+) -- if that were done, the better devices might get an "A" suffix on the part number. I guess that all recent packaged devices have passed the test at 1GHZ (or such higher speed as is used to give a margin for error). There may or may not be any way of knowing which devices passed which test (eg by date code).
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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 7:02 pm

I don't expect the failures are going in the other models, but all new 2835 Pi's can do 1Ghz as jamesh said in his 'future' comment.

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Re: Is a new Raspberry Pi model coming?

Tue Dec 01, 2015 8:33 pm

dom wrote:Two possibilities.
One: The SoC silicon you have is not capable of 1GHz ...
Two: The extra load on the power supply is causing a voltage droop ...
Seems to be fairly slow silicon (2.889MHz @1.2V). Just unlucky I guess. I might try 950MHz but have been more than happy with 900MHz anyway. Power supply is fine.

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Re: Is a new Raspberry Pi model coming?

Fri Dec 04, 2015 10:45 am

jamesh wrote:
timrowledge wrote:It's been 24hrs or more since the last model came out. When is the new one coming?
Week next Friday .
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Re: Is a new Raspberry Pi model coming?

Fri Dec 04, 2015 1:57 pm

ric96 wrote:
jamesh wrote:
timrowledge wrote:It's been 24hrs or more since the last model came out. When is the new one coming?
Week next Friday .
ahem...
Next week maybe?
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Re: Is a new Raspberry Pi model coming?

Fri Dec 04, 2015 2:18 pm

This could be a long thread ;)

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Re: Is a new Raspberry Pi model coming?

Fri Dec 04, 2015 2:24 pm

gordon77 wrote:This could be a long thread ;)
But you only need to pop in once a week, on a Friday....
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Re: Is a new Raspberry Pi model coming?

Fri Dec 04, 2015 2:49 pm

But this friday we were literally going to have a product "launch" :D
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Re: Is a new Raspberry Pi model coming?

Fri Dec 04, 2015 3:24 pm

ric96 wrote:But this friday we were literally going to have a product "launch" :D
Weather permitting :D
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Re: Is a new Raspberry Pi model coming?

Fri Dec 04, 2015 3:30 pm

alexeames wrote:
ric96 wrote:But this friday we were literally going to have a product "launch" :D
Weather permitting :D
Just looked at the weather reports for down there and think it's looking iffy for tonight although hoping i'm wrong

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