linux-kernel - Re: [PATCH v1 1/3] mmc: core: Add raw_boot_mult field to mmc_ext

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Date:   Mon, 2 Mar 2020 02:09:08 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Avri Altman <Avri.Altman@....com>, Jens Axboe <axboe@...nel.dk>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        David Heidelberg <david@...t.cz>,
        Peter Geis <pgwipeout@...il.com>,
        Stephen Warren <swarren@...dotorg.org>,
        Nicolas Chauvet <kwizart@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Billy Laws <blaws05@...il.com>
Cc:     "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Andrey Danin <danindrey@...l.ru>,
        Gilles Grandou <gilles@...ndou.net>,
        Ryan Grachek <ryan@...ted.us>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 1/3] mmc: core: Add raw_boot_mult field to mmc_ext_csd

01.03.2020 13:50, Avri Altman пишет:
> Hi,
>>
>>
>> In order to support parsing of NVIDIA Tegra Partition Table format, we
>> need to know the BOOT_SIZE_MULT value of the Extended CSD register
>> because
>> NVIDIA's bootloader linearizes the boot0/boot1/main partitions into a
>> single virtual space, and thus, all partition addresses are shifted by
>> the size of boot0 + boot1 partitions.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
>>  drivers/mmc/core/mmc.c   | 2 ++
>>  include/linux/mmc/card.h | 1 +
>>  2 files changed, 3 insertions(+)
>>
>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>> index f6912ded652d..88e5b4224d3c 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -417,6 +417,8 @@ static int mmc_decode_ext_csd(struct mmc_card
>> *card, u8 *ext_csd)
>>                 ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];
>>         card->ext_csd.raw_hc_erase_grp_size =
>>                 ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
>> +       card->ext_csd.raw_boot_mult =
>> +               ext_csd[EXT_CSD_BOOT_MULT];
> You might want at this point multiply it by 128K,
> And get rid of: part_size = ext_csd[EXT_CSD_BOOT_MULT] << 17;
> Below...

But it's not a *raw* _boot_mult anymore then. I'm not sure that it will
be a worthwhile change.