[maemo-developers] [maemo-developers] high speed (52/48Mhz) MMC mode added

[From: Kemal Hadimli]

works here too, with kingston 1gb mmcmobile (will get a 2gb later probably)
thanks!

Nokia770-26:~# time dd if=/dev/mmcblk0 of=/dev/null bs=8192 count=10240
10240+0 records in
10240+0 records out
real    0m 15.42s
user    0m 0.05s
sys     0m 2.03s

now if only they would make 4gb and 8gb mmcmobile cards. (samsung has
up to 8gb mmc's but no mmcmobile)

On 10/3/06, Koen Kooi <koen at dominion.kabel.utwente.nl> wrote:
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> Hash: SHA1
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> Frantisek Dufka schreef:
> > Hello,
> >
> > This kernel enables also 52Mhz high-speed MMC mode (works on Kingston
> > 2GB MMCmobile). Complete summary of changes:
> >
> > 1. legacy MMC cards run at 16Mhz instead of original 12Mhz (1.3x
> > speedup), my 64MB card included with N770 does not work with this,
> > others do work (Sandisk 1GB). I suppose the card is buggy as max DTR in
> > CSD is honored in MMC driver and card claims it can handle up to 20Mhz.
> >
> > 2. MMCplus/mobile cards run at 24 or 48Mhz only if cards claim to
> > support v4 specs, report its speed in EXT_CSD structure (26 vs 52Mhz)
> > and switch command to high-speed mode (CMD 6) worked.
>
> With my 1GB sandisk RS-MMC:
>
> time dd if=/dev/mmcblk0 of=/dev/null bs=8192
> count=10240 # 44.13 seconds
>
> Is that ~24MHz?
>
>
> regards,
>
> Koen
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-- 
Kemal