From: Stephen Warren <swarren@wwwdotorg.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 00/20] arm: rpi: Enable USB and Ethernet driver model Raspberry Pi
Date: Thu, 23 Jul 2015 22:17:29 -0600 [thread overview]
Message-ID: <55B1BC59.9040902@wwwdotorg.org> (raw)
In-Reply-To: <CAPnjgZ1cftWw-yuG_01NYA7UvfZfUACJBvt1xs5hPAEoDUoy3g@mail.gmail.com>
On 07/14/2015 09:44 AM, Simon Glass wrote:
> Hi Stephen,
>
> On 13 July 2015 at 22:52, Stephen Warren <swarren@wwwdotorg.org> wrote:
>> On 07/11/2015 08:04 AM, Simon Glass wrote:
>>> Hi Stephen,
>>>
>>> On 10 July 2015 at 23:34, Stephen Warren <swarren@wwwdotorg.org> wrote:
>>>> On 07/07/2015 08:53 PM, Simon Glass wrote:
>>>>> Raspberry Pi uses a DWC2 USB controller and a SMSC USB Ethernet adaptor.
>>>>> Neither of these currently support driver model.
>>>>>
>>>>> This series does the following:
>>>>> - Move Raspberry Pi to use device tree control (u-boot-dtb.bin instead of
>>>>> u-boot.bin)
>>>>
>>>> I'd strongly prefer not to do this. For one thing, it means we'd need
>>>> different U-Boot builds for each of the different RPi models, and we
>>>> currently don't need that (or perhaps we require users to create their
>>>> own u-boot-dtb.bin by choosing the right DTB to append). If it
>>>
>>> Why does device tree change how things work now? The get_board_rev()
>>> function currently deals with this. It doesn't look like rpi_board_rev
>>> is used anywhere else.
>>
>> Without a DT, the code is free to make all the board-rev-specific
>> decisions at run-time without external influence.
>>
>> With a DT, we either have to:
>>
>> a) Pick the DT for one particular board and use that everywhere, even if
>> it's incorrect for the actual board in use.
>>
>> b) Build a different U-Boot + DTB image for each board-rev, and put the
>> correct one on the SD card.
>>
>> Neither of those options seem like a good idea to me.
>
> How about:
>
> c) Leave the code as is, and not add a whole lot more device tree files.
>
> After all the kernel only has files for rpi and rpi_2. Why should we
> add one for each variant? If you don't want to do it, why do it?
For the kernel I do expect to add a DT file for each variant. That makes
sense since we expect a single kernel binary to run unmodified on all
HW, parameterize the HW setup via the DTB, and have an infrastructure to
pass the different DTs to the kernel easily.
For U-Boot, I'd like to continue to have a single-binary that runs on
all RPis (well, one for RPi 1, another for RPi 2). That's a very nice
usage model for users. That's not possible if U-Boot pulls everything
from DT and we have a different DT for each system (which only makes
sense so that we don't lie in the DT, or fail to represent the
differences between the models) since a single DT is embedded into the
U-Boot binary; there's no infra-structure to passing 1 of n DTBs to U-Boot.
next prev parent reply other threads:[~2015-07-24 4:17 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-08 2:53 [U-Boot] [PATCH 00/20] arm: rpi: Enable USB and Ethernet driver model Raspberry Pi Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 01/20] dm: net: Support usbethaddr environment variable Simon Glass
2015-07-08 4:04 ` Joe Hershberger
2015-07-08 20:31 ` Simon Glass
2015-07-08 20:43 ` Joe Hershberger
2015-07-08 21:07 ` Simon Glass
2015-07-20 13:56 ` Simon Glass
2015-07-20 18:10 ` Joe Hershberger
2015-07-21 21:25 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 02/20] dm: usb: Allow USB Ethernet whenever CONFIG_DM_ETH is not defined Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 03/20] dm: usb: Add an errno.h header to usb_ether.c Simon Glass
2015-07-27 23:31 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 04/20] dm: usb: Prepare dwc2 driver for driver-model conversion Simon Glass
2015-07-27 23:31 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 05/20] dm: usb: Add driver-model support to dwc2 Simon Glass
2015-07-27 23:32 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 06/20] net: smsc95xx: Sort the include files Simon Glass
2015-07-27 23:32 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 07/20] net: smsc95xx: Rename AX_RX_URB_SIZE to RX_URB_SIZE Simon Glass
2015-07-27 23:32 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 08/20] net: smsc95xx: Correct the error numbers Simon Glass
2015-07-27 23:32 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 09/20] net: smsc95xx: Prepare for conversion to driver model Simon Glass
2015-07-27 23:32 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 10/20] net: smsc95xx: Add driver-model support Simon Glass
2015-07-27 23:32 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 11/20] dm: serial: Update binding for PL01x serial UART Simon Glass
2015-07-08 22:00 ` Vikas MANOCHA
[not found] ` <1436324032-17931-12-git-send-email-sjg-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
2015-07-15 9:00 ` Linus Walleij
2015-07-15 9:00 ` [U-Boot] " Linus Walleij
[not found] ` <CACRpkdb=t21=qpqar5VXd4mtqTWrq6MvoX1OsVgmWpkyFqhj3w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-15 9:38 ` Arnd Bergmann
2015-07-15 9:38 ` [U-Boot] " Arnd Bergmann
2015-07-15 10:08 ` Linus Walleij
2015-07-15 10:08 ` [U-Boot] " Linus Walleij
[not found] ` <CACRpkdakAVcBT8phhbFjE+mkfA0pTcHYiaL0dV4UNieH54fd+w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-07-15 10:17 ` Arnd Bergmann
2015-07-15 10:17 ` [U-Boot] " Arnd Bergmann
2015-07-16 7:41 ` Geert Uytterhoeven
2015-07-16 7:41 ` [U-Boot] " Geert Uytterhoeven
2015-10-19 7:19 ` Linus Walleij
2015-10-19 7:19 ` [U-Boot] " Linus Walleij
2015-07-08 2:53 ` [U-Boot] [PATCH 12/20] dm: Support address translation for simple-bus Simon Glass
2015-07-27 23:32 ` Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 13/20] arm: rpi: Define CONFIG_TFTP_TSIZE to show tftp size info Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 14/20] arm: rpi: Bring in kernel device tree files Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 15/20] arm: rpi: Device tree modifications for U-Boot Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 16/20] arm: rpi: Enable device tree control for Rasberry Pi Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 17/20] arm: rpi: Drop the UART console platform data Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 18/20] arm: rpi: Drop the GPIO " Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 19/20] arm: rpi: Move to driver model for USB Simon Glass
2015-07-08 2:53 ` [U-Boot] [PATCH 20/20] arm: rpi: Use driver model for Ethernet Simon Glass
2015-07-11 5:34 ` [U-Boot] [PATCH 00/20] arm: rpi: Enable USB and Ethernet driver model Raspberry Pi Stephen Warren
2015-07-11 14:04 ` Simon Glass
2015-07-14 4:52 ` Stephen Warren
2015-07-14 15:44 ` Simon Glass
2015-07-24 4:17 ` Stephen Warren [this message]
2015-07-24 13:44 ` Tom Rini
2015-07-28 3:10 ` Stephen Warren
2015-07-28 13:55 ` Tom Rini
2015-07-28 15:44 ` Simon Glass
2015-08-01 3:10 ` Stephen Warren
2015-08-01 3:01 ` Stephen Warren
2015-07-16 14:10 ` Pavel Machek
2015-07-20 14:25 ` Simon Glass
2015-07-24 4:20 ` Stephen Warren
2015-08-03 23:45 ` Marek Vasut
2015-08-04 0:07 ` Simon Glass
2015-08-04 0:37 ` Marek Vasut
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=55B1BC59.9040902@wwwdotorg.org \
--to=swarren@wwwdotorg.org \
--cc=u-boot@lists.denx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.