using SD card on Broadcom 4709 eval board

using SD card on Broadcom 4709 eval board

[Abu Rasheda]

I have been trying to use SD card on Broadcom's 4709 eval board. Linux
kernel tree provided with SDK seems to have few SDIO drivers, but non
of them seems to be working or more accurately, loading them does not
list device in /proc/devices, so I can create block file to mount it.

After googling and searching through Linux kernel tree, it seems like
B43_SDIO is correct option to turn on, since the controller seems to
be on the Broadcom CPU (4709) process itself (am I correct ?).

So if B43_SDIO is correct option, I have not been able to turn it on
(when running make menuconfig). as it is not showing up.

depends on B43 && SSB_SDIOHOST_POSSIBLE && EXPERIMENTAL,

off the above B43 is only shows up in arch/ppc, which does not make
sense, as this CPU is arm based.

Any guidance will be appreciated.

Thanks

using SD card on Broadcom 4709 eval board

[Paul Bolle]

On Sat, 2014-11-22 at 14:46 -0800, Abu Rasheda wrote:
> I have been trying to use SD card on Broadcom's 4709 eval board. Linux
> kernel tree provided with SDK seems to have few SDIO drivers, but non
> of them seems to be working or more accurately, loading them does not
> list device in /proc/devices, so I can create block file to mount it.
> 
> After googling and searching through Linux kernel tree, it seems like
> B43_SDIO is correct option to turn on, since the controller seems to
> be on the Broadcom CPU (4709) process itself (am I correct ?).
> 
> So if B43_SDIO is correct option, I have not been able to turn it on
> (when running make menuconfig). as it is not showing up.
> 
> depends on B43 && SSB_SDIOHOST_POSSIBLE && EXPERIMENTAL,

EXPERIMENTAL was removed in v3.9. So this concerns a pre-v3.9 tree?

> off the above B43 is only shows up in arch/ppc,

You mean you can only set B43 if configuring for ARCH=ppc?

>  which does not make
> sense, as this CPU is arm based.
> 
> Any guidance will be appreciated.


Paul Bolle

using SD card on Broadcom 4709 eval board

[Abu Rasheda]

>
> > depends on B43 && SSB_SDIOHOST_POSSIBLE && EXPERIMENTAL,
>
> EXPERIMENTAL was removed in v3.9. So this concerns a pre-v3.9 tree?
>

Yes, it is 2.6 kernel. I know this is  extremely old.I just want to have SD
card working, any suggestions ?

> off the above B43 is only shows up in arch/ppc,
>
> You mean you can only set B43 if configuring for ARCH=ppc?
>
>
I did a grep and only found B43 under arch/ppc, so I guess when ARCH=ppc is
selected.


> >  which does not make
> > sense, as this CPU is arm based.
> >
> > Any guidance will be appreciated.
>
>
> Paul Bolle
>

So what I am missing ?
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using SD card on Broadcom 4709 eval board

[Paul Bolle]

On Sat, 2014-11-22 at 17:05 -0800, Abu Rasheda wrote:
>         > depends on B43 && SSB_SDIOHOST_POSSIBLE && EXPERIMENTAL,
>         
>         EXPERIMENTAL was removed in v3.9. So this concerns a pre-v3.9
>         tree?
>
> Yes, it is 2.6 kernel.

Which v2.6 release? There were 40, the first was released in December
2003, the last in May 2011. Quite a few things changed in that period.

> I know this is  extremely old.I just want to have SD card working, any
> suggestions ?

The "depends on" line you quoted was added in v2.6.32, which is still
supported, so the tree you're using might not be seen as "extremely old"
by everyone. 

>         > off the above B43 is only shows up in arch/ppc,
>         
>         You mean you can only set B43 if configuring for ARCH=ppc?
>
> I did a grep and only found B43 under arch/ppc, so I guess when
> ARCH=ppc is selected.

What did you actually grep for, and in what tree?

>         >  which does not make sense, as this CPU is arm based.
>         >
>         > Any guidance will be appreciated.
>
> So what I am missing ? 

Useful answers?

See, you original question was:
> I have been trying to use SD card on Broadcom's 4709 eval board. Linux
> kernel tree provided with SDK seems to have few SDIO drivers, but non
> of them seems to be working or more accurately, loading them does not
> list device in /proc/devices, so I can create block file to mount it.
> 
> After googling and searching through Linux kernel tree, it seems like
> B43_SDIO is correct option to turn on, since the controller seems to
> be on the Broadcom CPU (4709) process itself (am I correct ?).

It seems B43_SDIO supports wireless cards, of the Broadcom 43xx family,
that have a SDIO interface. I'm _guessing_ that these are (fairly
obscure) WLAN cards which can be plugged into a SD slot. Probably not
what you're looking for.

Which, actually, might be SD card support. Currently apparently
available through MMC, one of the options found in
drivers/mmc/host/Kconfig (perhaps MMC_SDHCI_BCM_KONA or
MMC_SDHCI_BCM2835?) and MMC_BLOCK.

Anyhow, grepping the mainline tree for 4709 did reveal "config
ARCH_BCM_5301X", which supports the BCM4709 SoC. But that Kconfig symbol
was only added in v3.15, see commit 5b293ebe7572 ("ARM: BCM5301X:
initial support for the BCM5301X/BCM470X SoCs with ARM CPU"). And that
still doesn't tell you what driver to use here.

The above is a verbose way to admit that I don't really know how to
determine what you need to get SD cards working. MAINTAINERS mentions
the bcm-kernel-feedback-list at broadcom.com list. Perhaps that can be of
help.


Paul Bolle

using SD card on Broadcom 4709 eval board

[Abu Rasheda]

On Sun, Nov 23, 2014 at 3:09 AM, Paul Bolle <pebolle@tiscali.nl> wrote:
> The "depends on" line you quoted was added in v2.6.32, which is still
> supported, so the tree you're using might not be seen as "extremely old"
> by everyone.

I think it i 3.6.3x where x is I think 4

> The above is a verbose way to admit that I don't really know how to
> determine what you need to get SD cards working. MAINTAINERS mentions
> the bcm-kernel-feedback-list at broadcom.com list. Perhaps that can be of
> help.

Appreciate your verbose thinking, appreciate it