From: Randy Dunlap <rdunlap@infradead.org>
To: "Gabriel L. Somlo" <gsomlo@gmail.com>, kernelnewbies@kernelnewbies.org
Subject: Re: Tutorial for "drivers/mmc/*"?
Date: Fri, 8 Jan 2021 20:27:54 -0800 [thread overview]
Message-ID: <85060973-8d39-156e-93db-3c8180060c54@infradead.org> (raw)
In-Reply-To: <20210107205419.GG2094049@errol.ini.cmu.edu>
On 1/7/21 12:54 PM, Gabriel L. Somlo wrote:
> Hi,
>
> I'm debugging a driver for a (fpga-based soft core) microSD card Linux
> device, and the existing driver (in drivers/mmc/host/...) makes sense
> at first sight, but, either due to shortcomings in the softcore
> (Verilog by way of Migen) "hardware", or the actual Linux driver
> itself, suffers from intermittent data transfer errors.
>
> I find myself wishing I could get a top-down idea of how the Linux mmc
> layer is put together, so I could examine the driver in question with
> a critical eye, rather than my current approach, which is best described
> as "blind-man attempts to comprehend an elephant by touching various
> locations on its body, hoping the collected experiences will suddenly
> come into focus and begin to make sense". :D
>
> This latter approach gives me information that makes sense on first
> sight, when taken uncritically, but doesn't help me figure out the
> "unknown unknowns" :)
>
> The alternative, of course, would be to read the actual source code in
> "drivers/mmc/core/..." until I "know it by heart", and then look at my
> (and a few other existing) drivers in "drivers/mmc/host/..." to try and
> get an idea of what I'm missing.
>
> I'll go with the latter if necessary, but would prefer a gentler
> introduction to "drivers/mmc". Any (link, pointer to) a tutorial,
> assuming one exists, would be MUCH appreciated!
>
> Thanks,
> --Gabriel
>
Hi,
The only & closest thing that I could find is
https://www.slideshare.net/rampalliraj/linux-kernel-mmc-storage-driver-overview
HTH.
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WARNING: multiple messages have this Message-ID (diff)
From: Randy Dunlap <rdunlap@infradead.org>
To: kernelnewbies@kernelnewbies.org
Subject: Re: Tutorial for "drivers/mmc/*"?
Date: Fri, 8 Jan 2021 20:27:54 -0800 [thread overview]
Message-ID: <85060973-8d39-156e-93db-3c8180060c54@infradead.org> (raw)
Message-ID: <20210109042754.o1DOgpyHzeMXfKE6ceUNj4ETyR_tVUEquuhXoyEBTI8@z> (raw)
In-Reply-To: <20210107205419.GG2094049@errol.ini.cmu.edu>
On 1/7/21 12:54 PM, Gabriel L. Somlo wrote:
> Hi,
>
> I'm debugging a driver for a (fpga-based soft core) microSD card Linux
> device, and the existing driver (in drivers/mmc/host/...) makes sense
> at first sight, but, either due to shortcomings in the softcore
> (Verilog by way of Migen) "hardware", or the actual Linux driver
> itself, suffers from intermittent data transfer errors.
>
> I find myself wishing I could get a top-down idea of how the Linux mmc
> layer is put together, so I could examine the driver in question with
> a critical eye, rather than my current approach, which is best described
> as "blind-man attempts to comprehend an elephant by touching various
> locations on its body, hoping the collected experiences will suddenly
> come into focus and begin to make sense". :D
>
> This latter approach gives me information that makes sense on first
> sight, when taken uncritically, but doesn't help me figure out the
> "unknown unknowns" :)
>
> The alternative, of course, would be to read the actual source code in
> "drivers/mmc/core/..." until I "know it by heart", and then look at my
> (and a few other existing) drivers in "drivers/mmc/host/..." to try and
> get an idea of what I'm missing.
>
> I'll go with the latter if necessary, but would prefer a gentler
> introduction to "drivers/mmc". Any (link, pointer to) a tutorial,
> assuming one exists, would be MUCH appreciated!
>
> Thanks,
> --Gabriel
>
Hi,
The only & closest thing that I could find is
https://www.slideshare.net/rampalliraj/linux-kernel-mmc-storage-driver-overview
HTH.
_______________________________________________
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Kernelnewbies@kernelnewbies.org
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next prev parent reply other threads:[~2021-01-09 4:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-07 20:54 Tutorial for "drivers/mmc/*"? Gabriel L. Somlo
2021-01-09 4:27 ` Randy Dunlap [this message]
2021-01-09 4:27 ` Randy Dunlap
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