[coreboot] Help on setting clock speed in coreboot

[Naveed Ghori]

The only thing I can think of is to use an oscilloscope to see if the signal is clear.
No changes were made to the USB as it just comes up to as a COM Port and I connect using putty at the required baud rate.
Are you using a Serial to USB or a real RS232 serial port? On Windows there are setting for each serial port (where you can set its baud rate etc, but I think these are for default connection and do not affect most terminal software that connect using a particular baud rate.

From: Mayuri Tendulkar [mailto:mayuri.tendulkar at aricent.com]
Sent: Wednesday, 13 July 2016 2:18 AM
To: Naveed Ghori; coreboot
Subject: Re: Help on setting clock speed in coreboot

Hi

Minnowboard also uses the same pin BD14 (GPIO_S0_SC[57]) as TX and 61 as RX and baud rate 115200.

We have not enabled post codes, but only enabled serial port console o/p.

It works fine on Minnowboard, but not on this.

So not getting any clue.

Regards
Mayuri

From: Naveed Ghori [mailto:naveed.ghori at dti.com.au]
Sent: 11 July 2016 20:03
To: Mayuri Tendulkar <mayuri.tendulkar at aricent.com<mailto:mayuri.tendulkar at aricent.com>>; coreboot <coreboot at coreboot.org<mailto:coreboot at coreboot.org>>
Subject: Re: Help on setting clock speed in coreboot

First thing is to get serial output as there will probably be other hurdles before the display works.
I used coreboot bayleybay as the basis and it had the port mentioned (pin BD14 (GPIO_S0_SC[57]))) setup for debug output and the baud rate of 115200.
Minnowboard may be different.
Also,  I had to setup the full 8MB of flash using the FITC tool but this is probably not your issue since you probably have serial output already.
All I can think of is baud rate setting under console in "make menuconfig".

Also the output may be setup to output POST codes only in which case to a text terminal it will like only junk is coming out. Make sure console debug level is set to DEBUG or SPEW to get a lot more debug initially.
Also Enable "Serial Port Console output"


From: Mayuri Tendulkar [mailto:mayuri.tendulkar at aricent.com]
Sent: Tuesday, 12 July 2016 10:53 AM
To: Naveed Ghori
Subject: Re: Help on setting clock speed in coreboot

We didn't change anything. Our base is valley island. As it was not having serial, we took tht part same as Minnowboard (PCU UART)

Tried different rates but doesn't work.

We checked TTL levels, so we were seeing freq as 38.4, so tried tht also.

Somehow its stuck somewhere as we don't see USB and display also not coming, but nt able to get exact data due to serial prints.

From: Naveed Ghori [mailto:naveed.ghori at dti.com.au]
Sent: 11 July 2016 19:48
To: Mayuri Tendulkar <mayuri.tendulkar at aricent.com<mailto:mayuri.tendulkar at aricent.com>>
Subject: Re: Help on setting clock speed in coreboot

Did you change anything? Is your base Bayley Bay? The default setting for it are 115200 with the output pin as per below.
Check the console settings in the menuconfig. If you are getting junk then I assume it is already enabled but maybe just the baud is modified by mistake.

From: Mayuri Tendulkar [mailto:mayuri.tendulkar at aricent.com]
Sent: Tuesday, 12 July 2016 10:45 AM
To: Naveed Ghori
Subject: Re: Help on setting clock speed in coreboot

But what settings to be added in coreboot config?

From: Naveed Ghori [mailto:naveed.ghori at dti.com.au]
Sent: 11 July 2016 18:42
To: Mayuri Tendulkar <mayuri.tendulkar at aricent.com<mailto:mayuri.tendulkar at aricent.com>>; coreboot <coreboot at coreboot.org<mailto:coreboot at coreboot.org>>
Subject: Re: Help on setting clock speed in coreboot

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:mayuri.tendulkar at aricent.com]
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:naveed.ghori at dti.com.au]
Sent: 11 July 2016 18:17
To: Mayuri Tendulkar <mayuri.tendulkar at aricent.com<mailto:mayuri.tendulkar at aricent.com>>; coreboot <coreboot at coreboot.org<mailto:coreboot at coreboot.org>>
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:coreboot-bounces at coreboot.org] 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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