linux-kernel - Re: [PATCH v3 4/4] tpm: add driver for cr50 on SPI

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Message-ID: <e7951cb251116e903cf0040ee6f271dc4e68ff2e.camel@linux.intel.com>
Date:   Fri, 09 Aug 2019 23:31:04 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Stephen Boyd <swboyd@...omium.org>, Peter Huewe <peterhuewe@....de>
Cc:     Andrey Pronin <apronin@...omium.org>, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        Duncan Laurie <dlaurie@...omium.org>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Alexander Steffen <Alexander.Steffen@...ineon.com>
Subject: Re: [PATCH v3 4/4] tpm: add driver for cr50 on SPI

On Tue, 2019-08-06 at 15:07 -0700, Stephen Boyd wrote:
> From: Andrey Pronin <apronin@...omium.org>
> 
> Add TPM2.0 PTP FIFO compatible SPI interface for chips with Cr50
> firmware. The firmware running on the currently supported H1
> Secure Microcontroller requires a special driver to handle its
> specifics:
> 
>  - need to ensure a certain delay between spi transactions, or else
>    the chip may miss some part of the next transaction;
>  - if there is no spi activity for some time, it may go to sleep,
>    and needs to be waken up before sending further commands;
>  - access to vendor-specific registers.

Which Chromebook models have this chip?

If I had an access to one, how do I do kernel testing with it i.e.
how do I get it to boot initramfs and bzImage from a USB stick?

/Jarkko