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Old 05-07-2016, 11:17 PM   #1
geekmaster
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Another way to upgrade to larger eMMC
Sticking it in the 3G socket:
http://hackingbeaver.com/?p=425

Color me impressed...

And a quote from that link:
Quote:
Apparently the Kindle does not provide 3.3V via the mini PCI-E connector, but directly the battery voltage! About 4.2V when the battery is fully charged. This was enough to fry one controller, luckily the eMMC chip is still alive. As a temporary fix until I think of a way to get 3.3V out of ~3V to 4.2V (at full charge), I had cut the power traces and added two diodes, when the battery is fully charged, the eMMC chip and the controller will be powered by ~3.6V, which is well within safe specs.
A voltage drop the same way I did in my TTL serial level shifter circuit.

And he built his kernel module with the same toolchian twobob used for a kernel module (CS2006q3): https://www.mobileread.com/forums/sho...72#post2186972
Last edited by geekmaster; 05-08-2016 at 12:16 AM.
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Old 05-10-2016, 09:30 AM   #2
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Nice gem! Thanks for the find...
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