From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: Bin Meng <bmeng.cn@gmail.com>
Cc: mbrugger@suse.com, U-Boot Mailing List <u-boot@lists.denx.de>,
Marek Vasut <marex@denx.de>,
linux-kernel <linux-kernel@vger.kernel.org>,
Simon Glass <sjg@chromium.org>,
m.szyprowski@samsung.com,
Sylwester Nawrocki <s.nawrocki@samsung.com>,
mark.kettenis@xs4all.nl
Subject: Re: [PATCH v3 1/2] arm: rpi: Add function to trigger VL805's firmware load
Date: Wed, 06 May 2020 10:31:51 +0200 [thread overview]
Message-ID: <f162c378380dc4b1bd2af24b44b30082b6e1e310.camel@suse.de> (raw)
In-Reply-To: <CAEUhbmWOQNDeStd3oDFTveiugzDG0zf0X1ybSWeCSP4QStNcPA@mail.gmail.com>
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Hi Bin,
On Wed, 2020-05-06 at 13:33 +0800, Bin Meng wrote:
> Hi Nicolas,
>
> On Wed, May 6, 2020 at 12:26 AM Nicolas Saenz Julienne
> <nsaenzjulienne@suse.de> wrote:
> > On the Raspberry Pi 4, after a PCI reset, VL805's (a xHCI chip) firmware
> > may either be loaded directly from an EEPROM or, if not present, by the
> > SoC's VideCore (the SoC's co-processor). Introduce the function that
> > informs VideCore that VL805 may need its firmware loaded.
> >
>
> I still did not get it. Without the firmware being loaded, does xHCI
> on RPi 4 still work?
On newer revisions of RPi4, no, it will not work.
> What exact functionality does the firmware provide?
It provides xHCI functionality.
The old RPi4 design loaded this vl805 firmware trough a dedicated EEPROM
memory. But they removed it, probably in order to save costs. They then created
this new interface to trigger a firmware load from RPi4's co-processor.
Regards,
Nicolas
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next prev parent reply other threads:[~2020-05-06 8:31 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-05 16:26 [PATCH v3 0/2] usb: xhci: Load Raspberry Pi 4 VL805's firmware Nicolas Saenz Julienne
2020-05-05 16:26 ` [PATCH v3 1/2] arm: rpi: Add function to trigger VL805's firmware load Nicolas Saenz Julienne
2020-05-06 5:33 ` Bin Meng
2020-05-06 8:31 ` Nicolas Saenz Julienne [this message]
2020-05-05 16:26 ` [PATCH v3 2/2] usb: xhci: Load Raspberry Pi 4 VL805's firmware Nicolas Saenz Julienne
2020-05-13 12:56 ` [PATCH v3 0/2] " Nicolas Saenz Julienne
2020-06-01 10:47 ` Nicolas Saenz Julienne
2020-06-01 10:53 ` Marek Vasut
2020-06-01 11:09 ` Nicolas Saenz Julienne
2020-06-01 11:12 ` Marek Vasut
2020-06-01 14:41 ` Nicolas Saenz Julienne
2020-06-01 15:27 ` Marek Vasut
2020-06-04 11:18 ` Nicolas Saenz Julienne
2020-06-04 11:52 ` Marek Vasut
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