From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v2 08/29] dm: Allow drivers to be marked 'before relocation'
Date: Fri, 11 Jul 2014 01:29:06 +0200 [thread overview]
Message-ID: <201407110129.06857.marex@denx.de> (raw)
In-Reply-To: <1404877099-7314-9-git-send-email-sjg@chromium.org>
On Wednesday, July 09, 2014 at 05:37:58 AM, Simon Glass wrote:
> Driver model currently only operates after relocation is complete. In this
> state U-Boot typically has a small amount of memory available. In adding
> support for driver model prior to relocation we must try to use as little
> memory as possible.
>
> In addition, on some machines the memory has not be inited and/or the CPU
> is not running at full speed or the data cache is off. These can reduce
> execution performance, so the less initialisation that is done before
> relocation the better.
>
> An immediately-obvious improvement is to only initialise drivers which are
> actually going to be used before relocation. On many boards the only such
> driver is a serial UART, so this provides a very large potential benefit.
>
> Allow drivers to mark themselves as 'pre-reloc' which means that they will
> be initialised prior to relocation. This can be done either with a driver
> flag or with a 'dm,pre-reloc' device tree property.
I think we should start marking those DT props something like 'u-boot,dm-pre-
reloc' instead . The same way as Linux marks it's own linux-specific DT props.
[...]
Best regards,
Marek Vasut
next prev parent reply other threads:[~2014-07-10 23:29 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-09 3:37 [U-Boot] [PATCH v2 0/29] Add additional core driver model features Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 01/29] dm: gpio: Don't use the driver model uclass for SPL Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 02/29] dm: Use an explicit expect value in core tests Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 03/29] stdio: Remove redundant code around stdio_register() calls Simon Glass
2014-07-10 23:23 ` Marek Vasut
2014-07-13 16:13 ` Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 04/29] stdio: Pass device pointer to stdio methods Simon Glass
2014-07-10 23:26 ` Marek Vasut
2014-07-11 4:29 ` Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 05/29] dm: Make sure that the root device is probed Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 06/29] dm: Provide a way to shut down driver model Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 07/29] sandbox: Remove all drivers before exit Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 08/29] dm: Allow drivers to be marked 'before relocation' Simon Glass
2014-07-10 23:29 ` Marek Vasut [this message]
2014-07-13 18:38 ` Simon Glass
2014-07-09 3:37 ` [U-Boot] [PATCH v2 09/29] dm: Support driver model prior to relocation Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 10/29] stdio: Provide functions to add/remove devices using stdio_dev Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 11/29] console: Remove vprintf() optimisation for sandbox Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 12/29] Add a flag indicating when the serial console is ready Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 13/29] dm: Move uclass error checking/probing into a function Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 14/29] fdt: Add a function to get the alias sequence of a node Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 15/29] dm: Move device display into its own function Simon Glass
2014-07-10 23:33 ` Marek Vasut
2014-07-11 4:27 ` Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 16/29] dm: Avoid activating devices in 'dm uclass' command Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 17/29] dm: Introduce device sequence numbering Simon Glass
2014-07-09 13:53 ` Jon Loeliger
2014-07-19 3:22 ` Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 18/29] dm: Display the sequence number for each device Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 19/29] dm: Allow a device to be found by its FDT offset Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 20/29] dm: Avoid accessing uclasses before they are ready Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 21/29] fdt: Add a function to get the node offset of an alias Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 22/29] dm: Tidy up some header file comments Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 23/29] dm: Provide a function to scan child FDT nodes Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 24/29] dm: Add functions to access a device's children Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 25/29] dm: Introduce per-child data for devices Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 26/29] dm: Add child_pre_probe() and child_post_remove() methods Simon Glass
2014-07-15 8:26 ` Pavel Herrmann
2014-07-17 5:41 ` Simon Glass
2014-07-17 7:09 ` Pavel Herrmann
2014-07-17 15:20 ` Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 27/29] dm: Improve errors and warnings in lists_bind_fdt() Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 28/29] dm: Add dm_scan_other() to locate board-specific devices Simon Glass
2014-07-09 3:38 ` [U-Boot] [PATCH v2 29/29] dm: Give the demo uclass a name Simon Glass
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