12:41 <dsseng> Hello chat! I'm working on bring-up of an RV1106 board (first for U-Boot mainline). I have most of the bits laid out already, ported from Rockchip U-Boot. DWC3, SARADC, INNO USB2PHY, MMC are working. WDT is TODO yet, and I think it'll be done for my use case. However, my question is how should I bring up a new SoC support in SDRAM controller? This

12:41 <dsseng> SoC uses a binary from rkbin to initialize the DDR memory, and I could not understand how do we properly get the memory size in U-Boot. I currently wrote a dummy impl, returning 256 MB, as that is what RV1106G3 SIP contains. Could anyone please hint me how and where to get info on the registers containing memory size? Thank you!

12:42 <dsseng> For anyone interested, here's my branch on top of recent U-Boot mainline: https://github.com/dsseng/u-boot/commits/rv1106/

15:01 <wens> dsimic: rock 5b has the PD chip connected to the SoC? I saw on other boards it was a standalone charger that had the optimal voltage set by a resistor

16:28 <walter> it doesn't seem to be. there's U4 connected to CC1 & CC2. It's a CH224.

16:29 <walter> And R30-R34 are used for configuration.

16:32 <walter> And it matches the reference schematic diagram, configured for 12V.

16:42 <walter> Question, does the master branch of meta-rockchip? I am getting a segfault during bitbake: https://paste.sr.ht/~schnwalter/2428f6ef0903ec3311dba315b39060d0cb19dee7 -- any ideas what could be the issue?

18:04 <sre> wens: Rock 5B has a fusb302 chip for USB PD. It's not standalone. Any PD communication is done manually from the CPU side via kernel (and bootloader) driver.

18:35 <walter> Oh, I missed that "B".

18:36 <walter> FUSB302 is nice, but you need a faily new u-boot and you need to configure it properly, otherwise you'll run into problems like: no power after 5s

18:37 <walter> s/faily/fairly/

18:38 <walter> I saw this recently: [PATCH 5/5] arm64: dts: rockchip: add USB-C support for ROCK 5B and 5B+ https://lists.infradead.org/pipermail/linux-rockchip/2025-March/057089.html

18:58 <Dex2x> dsimic, do you have a desktop card reader that supports A2?

19:12 <sre> walter: USB-C support for Rock 5B/5B+/5T will land in kernel 6.18 (latest link is https://lore.kernel.org/all/20250819-rock5bp-for-upstream-v4-1-7a2365ce7176@kernel.org/ )

21:12 <Dex2x> has anyone tried the "StarTech.com USB-C SD Express Card Reader" ? Seems like we just got to A2, and now everything is moving to SD Express

21:45 <walter> Thanks for the contribution!

23:27 <Dex2x> haha well these ali cards have odd write profiles

23:49 <Dex2x> The xiaomi high endurance A2, is doing well this far. AVg of 14MB/s just zero'ing so I can wipe whatever fat file system it had fully.

23:49 <Dex2x> Directly in my OPi5 ultra's SD card slot