eMMC upgrade

[EuvzO8]

[quote pid="119203" dateline="1691994961"]
The eMMC is slightly faster, can be twice as fast. The vccq mod is not advised, only works with some eMMCs, is highly risky and you make all images incompatible, so I would estimate there are less than a dozen people in total who made the mod, out of tens of thousands of sold PinePhones
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JFYI I've tried vccq mod and have performance measurements before and after for 16/2 PP. Here is my comparison of eMMC performance with SD card performance.

0. SD card (Sandisk Extreme Pro UHS-I U3 V30 A2 + ADP)

root@mobian:/home/mobian# hdparm -t -T /dev/mmcblk0
/dev/mmcblk0:
Timing cached reads:  802 MB in  2.00 seconds = 400.36 MB/sec
Timing buffered disk reads:  66 MB in  3.07 seconds =  21.51 MB/sec
root@mobian:/home/mobian# hdparm -t -T /dev/mmcblk0

1. eMMC speed (default, no vccq mod)

mobian@mobian:~$ sudo hdparm -t -T /dev/mmcblk2

/dev/mmcblk2:
Timing cached reads:  942 MB in  2.00 seconds = 470.48 MB/sec
Timing buffered disk reads: 242 MB in  3.02 seconds =  80.08 MB/sec

80.08/21.51 = 3.72 times faster than SD


2. eMMC speed (with vccq mod)

root@mobian:/home/mobian# hdparm -t -T /dev/mmcblk2

/dev/mmcblk2:
Timing cached reads:  894 MB in  2.00 seconds = 446.58 MB/sec
Timing buffered disk reads: 358 MB in  3.01 seconds = 118.98 MB/sec

118.98 / 21.51 = 5.53 times faster than SD

SD card is considerably slower than eMMC.

You can put stuff relevant for speed on the eMMC, like people used to do with their system on SSDs when the capacity was low. Everything else makes no reasonable economical sense.

This is what I'm doing right now. 16Gb isn't that big. I do understand, that BGA replacement is risky and costly operation. But maybe someone tried that.