From: Sascha Hauer <s.hauer@pengutronix.de>
To: Andrey Smirnov <andrew.smirnov@gmail.com>
Cc: Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH 04/15] ARM: Add arm64 pbl udelay
Date: Wed, 20 Mar 2019 09:16:07 +0100 [thread overview]
Message-ID: <20190320081607.prrfhjc7cgrzskns@pengutronix.de> (raw)
In-Reply-To: <CAHQ1cqFa97quXr6AW12AJKSbQ4+pN_TG71dNG83RrHVDBGSs8Q@mail.gmail.com>
On Tue, Mar 19, 2019 at 11:12:19AM -0700, Andrey Smirnov wrote:
> On Wed, Mar 13, 2019 at 3:27 AM Sascha Hauer <s.hauer@pengutronix.de> wrote:
> >
> > PBL often needs a way to udelay execution. Since we have a generic timer
> > in ARMv8 we can implement a generic udelay.
> >
>
> Now that get_cntpct() and get_cntfrq() are implemented for ARMv7 we
> can probably extend this to both ARMv8 and ARMv7.
Yes, we could do this. The problem is that this works only on ARMv7
cores that have this timer. What about the others? PBL code that depends
on udelay() can then only run on these cores. Arguably we already have
this problem when I introduce the symbol for ARMv8, but it probably gets
worse when we start using udelay in more places in PBL.
Any idea for a way to implement a udelay for the older cores?
Sascha
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next prev parent reply other threads:[~2019-03-20 8:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-13 9:41 [PATCH 00/15] barebox Layerscape support Sascha Hauer
2019-03-13 9:41 ` [PATCH 01/15] mci: imx-esdhc: Actually enable cache snooping Sascha Hauer
2019-03-13 9:41 ` [PATCH 02/15] Add Freescale QUICC Engine firmware support Sascha Hauer
2019-03-13 9:41 ` [PATCH 03/15] net: Add Freescale FMan ethernet support Sascha Hauer
2019-03-13 9:41 ` [PATCH 04/15] ARM: Add arm64 pbl udelay Sascha Hauer
2019-03-19 18:12 ` Andrey Smirnov
2019-03-20 8:16 ` Sascha Hauer [this message]
2019-03-22 6:41 ` Andrey Smirnov
2019-03-13 9:41 ` [PATCH 05/15] esdhc-xload: Add support for Layerscape Sascha Hauer
2019-03-13 9:41 ` [PATCH 06/15] watchdog: imx: Add register accessor functions Sascha Hauer
2019-03-13 9:41 ` [PATCH 07/15] watchdog: imx: Add big endian register access support Sascha Hauer
2019-03-13 9:41 ` [PATCH 08/15] scripts: Add Layerscape image tool Sascha Hauer
2019-03-13 9:41 ` [PATCH 09/15] i2c: i.MX: Add layerscape support Sascha Hauer
2019-03-13 9:41 ` [PATCH 10/15] ddr: fsl: Add Freescale ddr driver Sascha Hauer
2019-03-13 9:41 ` [PATCH 11/15] ARM: Add basic Layerscape support Sascha Hauer
2019-03-13 9:41 ` [PATCH 12/15] clk: Add Layerscape clk support Sascha Hauer
2019-03-13 9:42 ` [PATCH 13/15] ARM: Layerscape: Add LS1046a RDB board support Sascha Hauer
2019-03-13 9:42 ` [PATCH 14/15] ARM: Layerscape: Add TQ TQMLS1046a " Sascha Hauer
2019-03-13 9:42 ` [PATCH 15/15] ARM: Add layerscape_defconfig Sascha Hauer
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