[tpm2] Re: Installing on FreeBSD?

John Connett <jrc at skylon.me.uk> Mon, 04 Apr 2022 11:50:12 +0100

Newsgroups	dev.linux.lists.tpm2
Message-ID	<[email protected]>

On 01/04/2022 02:46, Tadeusz Struk wrote:

> On 3/31/22 15:04, John Connett wrote:
>>> did you "sudo kldload tpm" ?
>> I hadn't (on bare hardware the TPM was found automatically). Here's 
>> the output:
>>
>>     root(a)atelier2:~ # kldload tpm
>>     tpmcrb0: <Trusted Platform Module 2.0, CRB mode> iomem 
>> 0xfed40000-0xfed40fff
>>     on acpi0
>>     device_attach: tpmcrb0 attach returned 6
>>     tpmcrb0: <Trusted Platform Module 2.0, CRB mode> iomem 
>> 0xfed40000-0xfed40fff
>>     on acpi0
>>     device_attach: tpmcrb0 attach returned 6
>>     root(a)atelier2:~ #
>>
>> Still no /dev/tpm0
>
> 6 - ENXIO Device not configured. There is something wrong with that 
> device.
> You need to debug that first.
>
> https://www.freebsd.org/cgi/man.cgi?query=errno&sektion=2&manpath=freebsd-release-ports 
>
>
> Thanks,
> Tadeusz

I have built a debug kernel and am attempting to debug the tpm module. 
However, the tpm dtrace probes and symbols are not available until 
"kldload tpm" has run by which time the ENXIO error has occurred.

I could pepper the tpm driver code with kernel printf calls but was 
wondering if there is an eaier way?

Thanks
--
John

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