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Community Manager
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bldk & Intel SCH message Network

Hello.

I'm tring to read PMA base haddress in order to throttle the cpu clock (Z510 / U15W) by bios.

Reference data sheet is :

Intel® System Controller Hub

 

(Intel® SCH)

 

External Design Specification (EDS)

 

May 2010

 

Revision 2.21

To issue the read on Intel Sch Message Network I'm doing:

// Intel SCH Message Network (offset 0x70 port 4)

 

// opcode = 0xD0 (read)

 

// target port = 0x04

 

// Reg. Address = 0x70

 

// Byte Enable = 0x00

 

pciwrite32(0, 0, 0, 0xd4, 0x00000000); // Set MDR = 0

 

pciwrite32(0, 0, 0, 0xd0, 0xd0047000); // Issue Read command MCR

 

delay(100);

 

data32 = pciread32(0, 0, 0, 0xd4);

 

sprintf(buffer, "HOST BRIDGE PMBA = 0x%08X\n\r", data32);

 

writeString(buffer);

 

RepeatUntilKeyPressed();

The return code is always 0x4 (data32) what's wrong?

Best Regards

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1 Reply
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Valued Contributor I
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Wecome to the Intel® Embedded Community.

I want to make you aware of a special place to go with questions like yours. The Intel® e-Help desk is staffed by Intel representatives who support select Intel embedded platforms including Intel Atom™ and SCH.

To access e-Help, you need to be a Privileged member of the Intel® Embedded Community.

If you are not already a Privileged member, you can request an upgrade to your community account here:

https://edc.intel.com/My-Account.aspx https://edc.intel.com/My-Account.aspx

In addition to access to e-Help, Prvileged members may also access the confidential content within the Intel® Embedded Design Center, such as design documents, specifications, and training materials.

I hope this helps.

Felix

J. Felix McNulty

Community Moderator (Intel contractor)

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