From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Lucas Stach <l.stach@pengutronix.de>, barebox@lists.infradead.org
Subject: Re: [PATCH 1/3] ARM: cpu: suppress arm_early_mmu_cache_invalidate if dcache enabled
Date: Wed, 5 Aug 2026 13:59:20 +0200 [thread overview]
Message-ID: <9c0886a8-4293-4acb-9962-1347194dae71@pengutronix.de> (raw)
In-Reply-To: <ba9e9ab0-b16e-44b2-91e6-fb036d0e66f0@pengutronix.de>
Hello Lucas,
On 7/7/26 7:20 PM, Ahmad Fatoum wrote:
>> Also, by moving the call to a later point in the init flow later in the
>> series, are you sure that the invalidate happens before the I cache
>> gets enabled in arm_cpu_lowlevel_init()?
> arm_cpu_lowlevel_init() invalidates I cache on ARMv6 and ARMv7.
> I believe on ARMv8, it's not necessary?
>
> Interestingly, for ARMv8, I-Cache looks like it is only enabled early
> for EL3, but for EL2/1, it's enabled in mmu_early_enable(). Any reason
> for that?
Any thoughts on this?
Cheers,
Ahmad
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prev parent reply other threads:[~2026-08-05 12:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-07 8:05 Ahmad Fatoum
2026-07-07 8:05 ` [PATCH 2/3] ARM: v7r: factor out armv7r_cache_enable Ahmad Fatoum
2026-07-07 8:05 ` [PATCH 3/3] ARM: always call dcache_invalidate_stale before enabling D-Cache Ahmad Fatoum
2026-07-07 15:22 ` [PATCH 1/3] ARM: cpu: suppress arm_early_mmu_cache_invalidate if dcache enabled Lucas Stach
2026-07-07 17:20 ` Ahmad Fatoum
2026-08-05 11:59 ` Ahmad Fatoum [this message]
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