I noticed this as well, and I was on the verge of submitting a patch until I looked into it further and decided that the current default is justifiable.

Rockchip officially lists the UART speed of the RK3399 as 1500000 on their wiki, and their proprietary idbloader (I believe) uses 15000000 too. This indicates that Rockchip expects the UART to run at 1500000. However, there's nothing in the silicon itself that requires this, as the chip's BootROM doesn't use UART at all. Nor is there a prescribed baud rate in the datasheet or TRM.

Furthermore, although both U-Boot's RK3399 configs (example) and the DTS files in Linux for boards that generally use U-Boot (example) use 1500000, coreboot and the DTS files for boards that generally use coreboot (Chromebooks, example) use 115200. This means there isn't a de facto standard for baud rate, since Google has decided to use 115200 on their RK3399 products.

Since 115200 is a standard baud rate and 1500000 is very whacky, I'm inclined to just leave the default as is. It shouldn't matter with a properly configured AP_BL2 anyway, since it should pass in a DTB with the correct baud rate via the platform param which will override the default. U-Boot doesn't currently do this, probably because, up until very recently, TF-A would fail to parse the DTB because it was too large and crash. Luckily, the TF-A size limit has now been increased and I've submitted a patch to make sure it gracefully degrades to the default baud rate instead of crashing should the DTB get too large again. So in a few months, it should be safe to re-enable platform param passing in U-Boot.

Thanks for your comments and clarification. I should have updated this ticket with the information provided in the mail list, in order to keep them in sync.

I agree with you and hope that in a few months we can re enable the option.

If you would like to change the rankdle baudrate back to 1500000 or any other desired value, you will need to modify the RK3399_BAUDRATE definition in the rk3399_def.h file to reflect your preferred baudrate. After making the change, you will need to rebuild and flash the firmware for it to take effect.

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