pine64-pinephone: Add support for eMMC Vccq hardware mod

Related issue: #1285 (closed)

This merge request contains the following changes:

• Compile pinephone dts with -@ option so that is contains symbols used by DT overlays
• Make U-boot script boot.scr load an external user.scr script, no effect if user.scr is not present
• In user.scr load and apply the Device Tree Overlay that matches the regulator change of Vccq mod and enables HS200
• Ship user.scr and pinephone-vccq-mod.dtbo files in a subpackage of device-pine64-pinephone, that can be installed manually.

This change has no effect on a regular PinePhone pmos installation.
If one performs the eMMC Vccq mod the phone will boot fine but without speed increase.
By installing the package device-pine64-pinephone-vccq-mod, a Device Tree Overlay is applied at boot and you get double speed from the eMMC (HS200 mode).

The change is persistent for the current pmos installation, and should survive u-boot and kernel updates, but the subpackage has to be installed again after formatting.

I have tested the changes on my modded PinePhone 1.2, it works fine with and without the subpackage installed.

I can provide a guide for the hardware modification in the wiki, pinephone page or dedicated page?.

changed the description

By Federico Amedeo Izzo on 2021-11-06T21:46:04

This is pretty awesome @symmetrist, thanks a lot! I like how it's packaged.

Besides the pkgdesc and missing documentation in the wiki, this looks good to me.

By Oliver Smith on 2021-11-08T13:25:03

ERROR: Job failed: execution took longer than 1h0m0s seconds

CI fails due to a default timeout setting on your pmaports fork. Set CI timeout to 3h in you fork CI settings and retry pipeline

By Alexey Min on 2021-11-08T13:25:19

added 14 commits

• a3c938d7...52d860f6 - 12 commits from branch postmarketOS:master
• 498c0b06 - pine64-pinephone: Add support for eMMC Vccq hardware mod
• d8298911 - device-pine64-pinephone-vccq-mod: Add pkgdesc with hw mod warning

Compare with previous version

By Federico Amedeo Izzo on 2021-11-08T19:10:41

Not necessarily related to this MR, but it would be really nice if JumpDrive also had support for this change, so that folks who do the mod will still have access to that great tool to recover, backup, and so on.

By clayton craft on 2021-11-10T14:25:27

approved this merge request

By Martijn Braam on 2021-11-10T14:35:21

resolved all threads

By Federico Amedeo Izzo on 2021-11-10T15:14:14

approved this merge request

By Oliver Smith on 2021-11-10T19:00:55

added 2 commits

• 80e35c5e - 1 commit from branch postmarketOS:master
• cc123ebb - pine64-pinephone: Add support for eMMC Vccq hardware mod (MR 2665)

Compare with previous version

By Oliver Smith on 2021-11-10T19:06:23

merged

mentioned in issue #1285 (closed)

By Federico Amedeo Izzo on 2021-11-11T14:24:32

The schematics also have this little note: , does anyone know why it suggests also making this change for 1.8v eMMC?

EDIT: did some more reading and this related to the eMMC DATA lines, not the controller stuff. So not actually relevant it seems

By Caleb Connolly on 2021-11-17T11:02:33

Setting Vccq at 1.8V changed the eMMC microcontroller voltage, but also the I/O lines voltage, so the note should be relevant.

But I have not found any R423 on the schematic and R401 seems to be already populated near the DRAM (DU1-A symbol in the schematic)

By Federico Amedeo Izzo on 2021-11-17T11:02:33

mentioned in merge request !3068 (closed)

By Bart Ribbers on 2022-04-10T16:01:00