From: Mark Rutland <mark.rutland@arm.com>
To: Peter Hoyes <peter.hoyes@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, andre.przywara@arm.com,
diego.sueiro@arm.com, jaxson.han@arm.com,
vladimir.murzin@arm.com
Subject: Re: [boot-wrapper PATCH] Makefile: Change COUNTER_FREQ to 100 MHz
Date: Tue, 15 Feb 2022 12:29:08 +0000 [thread overview]
Message-ID: <YguchAJxE+scVj6U@FVFF77S0Q05N> (raw)
In-Reply-To: <20220215115418.678223-1-peter.hoyes@arm.com>
On Tue, Feb 15, 2022 at 11:54:18AM +0000, Peter Hoyes wrote:
> From: Peter Hoyes <Peter.Hoyes@arm.com>
>
> Older Arm Fast Models (AEM < RevC) had a base frequency of 24 MHz. but
> the RevC base models use 100 MHz. There is not a robust method of
> determining the configured base frequency at runtime, so update
> COUNTER_FREQ to be 100 MHz.
This looks right to me; if no-one shouts in the next day or two I'll apply
this.
In future, if we need this to be configurable, I reckon we can either add a
specific option for this or a more general "platform" option which can also
know about other things which aren't in the DTB.
Thanks,
Mark.
>
> Signed-off-by: Peter Hoyes <Peter.Hoyes@arm.com>
> ---
> Makefile.am | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Makefile.am b/Makefile.am
> index 08e304a..6ebece2 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -13,7 +13,7 @@ SCRIPT_DIR := $(top_srcdir)/scripts
> PHYS_OFFSET := $(shell perl -I $(SCRIPT_DIR) $(SCRIPT_DIR)/findmem.pl $(KERNEL_DTB))
> UART_BASE := $(shell perl -I $(SCRIPT_DIR) $(SCRIPT_DIR)/findbase.pl $(KERNEL_DTB) 0 'arm,pl011')
> SYSREGS_BASE := $(shell perl -I $(SCRIPT_DIR) $(SCRIPT_DIR)/findbase.pl $(KERNEL_DTB) 0 'arm,vexpress-sysreg' 2> /dev/null)
> -COUNTER_FREQ := 24000000
> +COUNTER_FREQ := 100000000
>
> CPU_IDS := $(shell perl -I $(SCRIPT_DIR) $(SCRIPT_DIR)/findcpuids.pl $(KERNEL_DTB))
> NR_CPUS := $(shell echo $(CPU_IDS) | tr ',' ' ' | wc -w)
> --
> 2.25.1
>
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next prev parent reply other threads:[~2022-02-15 12:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-15 11:54 [boot-wrapper PATCH] Makefile: Change COUNTER_FREQ to 100 MHz Peter Hoyes
2022-02-15 12:29 ` Mark Rutland [this message]
2022-03-01 11:18 ` Peter Hoyes
2023-01-30 14:38 ` Mark Rutland
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