Re: [coreboot] Help on setting clock speed in coreboot

[Naveed Ghori]

We take the pins direct off the E3845 (only really need the tx (pin BD14 (GPIO_S0_SC[57]))). The pins direct are TTL so we had to use a TTL-USB serial port converter.

From: Mayuri Tendulkar [mailto:[e-mail]]
Sent: Tuesday, 12 July 2016 9:37 AM
To: Naveed Ghori; coreboot
Subject: Re: Help on setting clock speed in coreboot

Thanks. We tried 115200, but it didn't work. We checked TTL levels and tried to match, but no luck.

Are you using PCU UART (same as minnowboard) or anything different?

From: Naveed Ghori [mailto:[e-mail]]
Sent: 11 July 2016 18:17
To: Mayuri Tendulkar <[e-mail]>; coreboot <[e-mail]>
Subject: Re: Help on setting clock speed in coreboot

Hi,
Garbage usually means baud rate. Did you try 115200baud?
If you are still getting garbage I would recommend seeing it on the scope and making sure voltage levels are fine. The output by default would be TTL level and may need to be converted.
I have used some TTL (1.8V if I remember correctly (TTL-232RG) to convert the signal so I could read the output.

Cheers,
Naveed

From: coreboot [mailto:[e-mail]] On Behalf Of Mayuri Tendulkar
Sent: Tuesday, 12 July 2016 8:27 AM
To: coreboot
Subject: [coreboot] Help on setting clock speed in coreboot

Hi Team

I have a customized board based on Intel valley island design. Reference design uses Intel Baytrail processor E3825, while my design is using E3845.

I am customizing coreboot for this E3845, but getting just garbage on coreboot, so not able to debug where it is stuck.

When I add memory test as secondary payload, I cd see some operations happening on console but not able to decode it.

Tried with all possible baud rates, but no success. USB and display also not enumerating.

Can you please give some clue? Is it due to different core speed for E3835(1.33GHZ) vs E3845(1.91GHz).

Where is the option to change this in coreboot?

Appreciate your support.

Regards
Mayuri
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