[coreboot] TPM support for SeaBIOS -- looking for a tester on real hardware

Stefan Berger stefanb at linux.vnet.ibm.com
Thu Sep 8 14:19:07 CEST 2011

On 09/08/2011 06:49 AM, Rudolf Marek wrote:
> Hi
> >no clue how TPM works, never played with it so far... :)
> Well as far I know it is just a LPC device (if it is 1,1 device), make 
> sure the region for that chip is decoded and enable
> decoding of 0xfed0_0000 (sorry do not remember right range out of my 
> head) in chipset which is needed for special LPC cycles. That is all I 
> know. This special cycles have something in common with SKINIT or 
> maybe with TPM 1.2
A TPM 1.2 device has its mmio region at fed4 0000 - fed4 4fff. I am not 
sure whether coreboot needs to program some other hardware to enable 
that region but in Qemu with TPM device model SeaBIOS either did that or 
it 'just worked'.


> http://www.informit.com/articles/article.aspx?p=1154764&seqNum=3
> Thanks
> Rudolf

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