From: Arseniy Krasnov <avkrasnov@salutedevices.com>
To: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>,
Vignesh Raghavendra <vigneshr@ti.com>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
Neil Armstrong <neil.armstrong@linaro.org>,
Kevin Hilman <khilman@baylibre.com>,
Jerome Brunet <jbrunet@baylibre.com>,
Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
<linux-mtd@lists.infradead.org>, <devicetree@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-amlogic@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <oxffffaa@gmail.com>,
<kernel@sberdevices.ru>
Subject: Re: [PATCH v5 1/2] dt-bindings: mtd: amlogic,meson-nand: support fields for boot ROM code
Date: Tue, 7 May 2024 10:35:51 +0300 [thread overview]
Message-ID: <e3ea7238-c80d-dfe9-28bf-df95708872d6@salutedevices.com> (raw)
In-Reply-To: <20240507092726.4ab1afdb@xps-13>
On 07.05.2024 10:27, Miquel Raynal wrote:
> Hi Arseniy,
>
> avkrasnov@salutedevices.com wrote on Tue, 7 May 2024 09:53:06 +0300:
>
>> On 06.05.2024 16:48, Miquel Raynal wrote:
>>> Hi Arseniy,
>>>
>>> avkrasnov@salutedevices.com wrote on Tue, 16 Apr 2024 11:51:00 +0300:
>>>
>>>> Boot ROM code on Meson requires that some pages on NAND must be written
>>>> in special mode: "short" ECC mode where each block is 384 bytes and
>>>> scrambling mode is on.
>>>
>>> Ok
>>>
>>>> Such pages located with the specified interval within specified offset.
>>>
>>> I'm sorry I don't get that sentence.
>>
>> Sorry, I mean this (let me draw :) ) :
>>
>> [ page 0 ][ page 1 ][ page 2 ][ page 3 ][ page 4 ][ page 5 ][ page 6 ][ page 7 ][ page 8 ][ page 9 ]
>>
>> For example, we have 10 pages starting from the beginning of the chip - this is "within specified offset",
>> e.g. offset is 10. BootROM on axg needs that (for example) every third page must be written in "special"
>> mode: scrambling is on and ECC is 384 bytes. Such pages are 0, 2, 4, 6, 8. E.g. "specified interval" will
>> be 3.
>
> Shall be 2, no?
yes, starting from 0 - then 2. e.g.
if (!(page_num % 2))
boot ROM need this page
>
>>
>> So:
>>
>> amlogic,boot-pages: 10
>> amlogic,boot-page-step: 3
>
> Ok I get it. Thanks for the explanation. I don't really understand the
> logic behind it though. Do you know why the bootROM would access only
> one page over 2 or 3? Is there a default value? Is this configurable?
No, boot rom source is closed, I don't have access to it. I get this logic
from old version of vendor's uboot - in practice they use non 2 or 3, they
use hardcoded 128 step value. And amlogic,boot-pages is 1024
Thanks, Arseniy
>
> Thanks,
> Miquèl
next prev parent reply other threads:[~2024-05-07 7:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-16 8:50 [PATCH v5 0/2] Meson: R/W support for pages used by boot ROM Arseniy Krasnov
2024-04-16 8:51 ` [PATCH v5 1/2] dt-bindings: mtd: amlogic,meson-nand: support fields for boot ROM code Arseniy Krasnov
2024-04-17 18:12 ` Rob Herring
2024-05-06 13:48 ` Miquel Raynal
2024-05-07 6:53 ` Arseniy Krasnov
2024-05-07 7:27 ` Miquel Raynal
2024-05-07 7:35 ` Arseniy Krasnov [this message]
2024-05-07 8:05 ` Miquel Raynal
2024-05-07 8:11 ` Arseniy Krasnov
2024-04-16 8:51 ` [PATCH v5 2/2] mtd: rawnand: meson: support R/W mode for boot ROM Arseniy Krasnov
2024-05-02 5:09 ` Arseniy Krasnov
2024-05-06 8:47 ` Miquel Raynal
2024-05-06 8:37 ` Arseniy Krasnov
2024-05-06 13:53 ` Miquel Raynal
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