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From: E Shattow <e@freeshell.de>
To: Marek Vasut <marek.vasut@mailbox.org>, Tom Rini <trini@konsulko.com>
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>,
	Leo Liang <leo.liang@sifive.com>,
	u-boot@lists.u-boot-project.org
Subject: Re: [PATCH] lmb: Add StarFive JH-7110 SoC as requiring DMA below 4G
Date: Tue, 29 Sep 2026 18:51:24 -0700	[thread overview]
Message-ID: <8a759e95-866e-460c-9899-d5bb30ff4e04@freeshell.de> (raw)
In-Reply-To: <bdec8558-0408-4efc-8a50-e726c8be9cee@mailbox.org>

Hi,

On 9/29/26 17:43, Marek Vasut wrote:
> On 9/30/26 1:07 AM, E Shattow wrote:
>> Platform drivers and hardware for StarFive JH-7110 SoC are not capable of
>> DMA access above 4GB
> 
> 4 GiB

Yes, I agree.

> 
>> . This was previously a problem for MMC access then
>> resolved by a workaround, since reverted in a3075db94d49 ("lmb: Reinstate
>> access to memory above ram_top"). The symptom of this is EFI boot failure
>> of GRUB from EFI System Partition on USB MSC with a starfive_visionfive2
>> board target that has the on-chip Cadence USB, tested with Pine64 Star64.
>>
>> Restore the workaround with a dependency on LMB_LIMIT_DMA_BELOW_RAM_TOP.
>>
>> Signed-off-by: E Shattow <e@freeshell.de>
> 
> Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

Looks good to me as suggested.

Thanks,  -E



  reply	other threads:[~2026-09-30  1:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-29 23:07 [PATCH] lmb: Add StarFive JH-7110 SoC as requiring DMA below 4G E Shattow
2026-09-30  0:43 ` Marek Vasut
2026-09-30  1:51   ` E Shattow [this message]
2026-09-30 14:18     ` Tom Rini
2026-09-30 17:17 ` Tom Rini

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