Madhusudhan c wrote:
>
> Philip asked me about the access to the 8-bit controller. We might not
> be able to provide you direct access to the hardware platform as it
> requires involvement of business managers and so on. But can I be of
> help by testing your code on our platform and leting you
Madhusudhan c wrote:
Philip asked me about the access to the 8-bit controller. We might not
be able to provide you direct access to the hardware platform as it
requires involvement of business managers and so on. But can I be of
help by testing your code on our platform and leting you know
Hi Pierre/Philip,
I've looked through the MMC 4.2 spec and I see nothing in it that even hints
that 8-bit support might be optional. So as it stands, the bus testing is still
out.
Okay. Its possible that my understanding was wrong in the sense that I
thought bus testing procedure is mandatory
Hi Pierre/Philip,
I've looked through the MMC 4.2 spec and I see nothing in it that even hints
that 8-bit support might be optional. So as it stands, the bus testing is still
out.
Okay. Its possible that my understanding was wrong in the sense that I
thought bus testing procedure is mandatory
Madhusudhan c wrote:
>
> Suppose a host controller is capable of suporting 8-bit and it tells
> the core that it can support 8-bit. Now the card that is plugged in
> might or might not support 8-bit based on the type of the card. There
> is no field in the ext_csd which will tell you what bus
Madhusudhan c wrote:
Suppose a host controller is capable of suporting 8-bit and it tells
the core that it can support 8-bit. Now the card that is plugged in
might or might not support 8-bit based on the type of the card. There
is no field in the ext_csd which will tell you what bus width
Madhusudhan c wrote:
>
> Suppose a host controller is capable of suporting 8-bit and it tells
> the core that it can support 8-bit. Now the card that is plugged in
> might or might not support 8-bit based on the type of the card. There
> is no field in the ext_csd which will tell you what bus
Hi Perre,
Until 8-bit SD shows up, at which point things go to hell again.
You need to present a valid case for why we need this bus testing stuff. The
spec never requires it, and neither does any cards. So this is just crud that we
know causes problems and doesn't give us anything back.
Madhusudhan c wrote:
Suppose a host controller is capable of suporting 8-bit and it tells
the core that it can support 8-bit. Now the card that is plugged in
might or might not support 8-bit based on the type of the card. There
is no field in the ext_csd which will tell you what bus width
Madhusudhan c wrote:
>
> The bus test procedure from this patch can be adopted to the MMCv4
> support in the MMC core with small changes to do bus testing procedure
> only if the host sets the capability to support 8-bit. That way we
> dont break the legacy code. What do you think?
>
Until
Hi Perre,
I don't think I've seen that patch. And now we have the work by Philip and
myself which adds support for both MMC 4.0 and 4.2. The only missing piece is
8-bit data and I'm not that interested in adding it until we have a driver that
can use it.
Here is a link to that patch.
Hi Perre,
I don't think I've seen that patch. And now we have the work by Philip and
myself which adds support for both MMC 4.0 and 4.2. The only missing piece is
8-bit data and I'm not that interested in adding it until we have a driver that
can use it.
Here is a link to that patch.
Madhusudhan c wrote:
The bus test procedure from this patch can be adopted to the MMCv4
support in the MMC core with small changes to do bus testing procedure
only if the host sets the capability to support 8-bit. That way we
dont break the legacy code. What do you think?
Until 8-bit SD
Madhusudhan c wrote:
>
> Kyung-ju Hyun from samsung had submitted a patch for MMCPlus support
> long back, which had the bus testing procedure implemented and it
> works fine. I am able to write and read the data pattern back
> successfuly with his patch. I am not sure why his patch was not
>
Hi Perre/Philip,
Feel free to add me as cc in the future if you want me to notice your mail ;)
Sure. In fact I looked around to find your email id and did not find
it. In future I will include you in cc.
We haven't determined it as necessary, and as Philip commented, most (if not
all)
Madhusudhan c wrote:
> Hi Pierre/philip,
>
Hi Madhusudhan,
Feel free to add me as cc in the future if you want me to notice your mail ;)
> This is regarding the MMCv4 support that came in as part of the MMC
> core of 2.6.20 linux kernel version.
>
> The high speed MMC cards can support
Madhusudhan c wrote:
Hi Pierre/philip,
Hi Madhusudhan,
Feel free to add me as cc in the future if you want me to notice your mail ;)
This is regarding the MMCv4 support that came in as part of the MMC
core of 2.6.20 linux kernel version.
The high speed MMC cards can support 4-bit/8-bit
Hi Perre/Philip,
Feel free to add me as cc in the future if you want me to notice your mail ;)
Sure. In fact I looked around to find your email id and did not find
it. In future I will include you in cc.
We haven't determined it as necessary, and as Philip commented, most (if not
all)
Madhusudhan c wrote:
Kyung-ju Hyun from samsung had submitted a patch for MMCPlus support
long back, which had the bus testing procedure implemented and it
works fine. I am able to write and read the data pattern back
successfuly with his patch. I am not sure why his patch was not
Madhusudhan c wrote:
> Hi Pierre/philip,
>
> This is regarding the MMCv4 support that came in as part of the MMC
> core of 2.6.20 linux kernel version.
>
> The high speed MMC cards can support 4-bit/8-bit transfers. The 8-bit
> support seems to be missing from the MMCv4 support implemented by
>
Hi Pierre/philip,
This is regarding the MMCv4 support that came in as part of the MMC
core of 2.6.20 linux kernel version.
The high speed MMC cards can support 4-bit/8-bit transfers. The 8-bit
support seems to be missing from the MMCv4 support implemented by
Philip Langdale .
To support 8-bit
Hi Pierre/philip,
This is regarding the MMCv4 support that came in as part of the MMC
core of 2.6.20 linux kernel version.
The high speed MMC cards can support 4-bit/8-bit transfers. The 8-bit
support seems to be missing from the MMCv4 support implemented by
Philip Langdale .
To support 8-bit
Madhusudhan c wrote:
Hi Pierre/philip,
This is regarding the MMCv4 support that came in as part of the MMC
core of 2.6.20 linux kernel version.
The high speed MMC cards can support 4-bit/8-bit transfers. The 8-bit
support seems to be missing from the MMCv4 support implemented by
Philip
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