notaz
Certified Guru
That can't always be done reliably, but I guess with Pyra's hardware it could work.Probe will not find the chip and further on, the extra information in the DTB is ignored.
That can't always be done reliably, but I guess with Pyra's hardware it could work.Probe will not find the chip and further on, the extra information in the DTB is ignored.
So I suggest a 64 GB eMMC variant that "happens" to have 4 or 8 GB RAM chips, but only 2 GB RAM of which is advertised/officially supported.Different eMMC sizes are automatically detected (like different MMC card sizes). Only different RAM sizes are tricky, but more a problem for different U-Boot/MLO variants.
So in theory it wouldn't be that big of a deal to offer both 4G and WiFi-only with 2GB or 4GB?In theory yes, but the MOQ (minimum order quantity) for the eMMC is 1600, which means we need to sell that many units of that variant.
With the RAM chip, we don't need two different chips but we just need to populate less of the same one.
Although, if the memory setup is like Exophase mentioned in another thread, populating half of the chips would incur a severe performance penalty.In theory yes, but the MOQ (minimum order quantity) for the eMMC is 1600, which means we need to sell that many units of that variant.
With the RAM chip, we don't need two different chips but we just need to populate less of the same one.
Would be nice to know the numbers with the 4 GB hardware with only 2 GB enabled (powering off one of the modules)...If you got two prototypes with different amounts of RAM but the same setup in general, could you somehow measure the additional power drain or just test how much longer it runs with 2 instead of 4?
So in theory it wouldn't be that big of a deal to offer both 4G and WiFi-only with 2GB or 4GB?
And that fan... Do something?
Would it even fit though?Well, to be able to blow out enough air... I guess it will need to whirr with an awkward sound
Well, to be able to blow out enough air... I guess it will need to whirr with an awkward sound
And melted SD cards.I think air blowing out at 100 degrees C = lawsuit (and a very short chip life)
IFF you're going to try something like that, may I recommend having it mounted high in the non-wired hinge side void (where Pandora has light pipes) and blowing -in- such that the SD card slots become the exit vent?
If the fan pushes -in- 1 mole of 21*C air and the air picks up enough energy to move to 100*C, a considerably larger volume of air will exit than enter.
1 mole of air weighs ~28.8 grams.
1 mole of air at 1 atmosphere and 21*C is ~24 liters (volume per mole in).
1 mole of air at SLC is ~24.5 liters.
1 mole of air at 1 atmosphere and 100*C is ~30.6 liters (volume per mole out).
Air Specific heat = 1.01J/gC
Changing air from 21*C to 100*C for 1g of air = (1*79)/1.01 = 78.2 Joules transferred per gram of air in.
Assuming the system needs to shed 3 Watts per hour, 3 Watt-hours ~ 10800 Joules.
10800/78.2 = 138.1 g of air per hour.
138.1 g ~ 4.79 moles ~ 115 liters per hour ~ 2 liters per minute in.
It wouldn't have to blow all that much air in to be effective. If you're going to consider this, be sure to have someone else run the numbers. What I did above is very back of the envelope and doesn't take into account any of the other methods for the heat to get out.