I believe that there is a timing hazard in cycles_delay(), from spi.c (second function in the file).

I'm assuming that successive calls to get_cycle() in the loop:
   while (get_cycles() > future) ;
can (usually or always do) return values that differ by more than one from call to call.  Then, if future turns out to be the maximally small number (0x7FFFFFFF, if, indeed, cycle_t is a 32 bit signed integer, 0 if it is actually unsigned), it is possible, when get_cycle() wraps, that it will skip past the value in future, leading to an additional delay until at least the next time get_cycle() wraps.  A very easy fix is to change the loop to:
   while (get_cycles() > now) ;

This is not to say that I've experienced this problem, but I currently have too much time on my hands, and was reading the code because I'm curious about the SD interface.

Hi all,

I am using Kingston 512MB 50X SD card on WRT54GL@250MHz with mmc driver version 1.3.4.
I got write speed only 170KBps for 150MB testing data.

Please advise me what should I do for faster speed as Cyril said (850KB/s WRITE, 450KB/s READ).

Hi all,

I just want to report my test.
Now, I got 550KB/s WRITE, 400KB/s READ when I format SD card in ext2 format faster than vfat format.
However, I do not reach the max Cyril's speed.

Well, now I got 700KB/s WRITE, 445KB/s READ when using 2GB 150X SD. The old on is 512MB 50X SD.

(Last edited by lsomchai on 3 Feb 2008, 10:07)

Is there also a mmc.o for the wap54g ???

i tried several mmc.o 's but all gave me an mmc_card_init error.

i use whiterussian 0.9 ( kamikaze is still not running poroper on my wap54g, and get's to big)

used these howto's:
http://www.linksysinfo.org/forums/showthread.php?t=44464
http://panteltje.com/panteltje/wap54g/to-linksys-wap54g-forum-2.txt

Cheers, Collen

(Last edited by collen on 15 Feb 2008, 11:46)

Hey,

im runnin a Buffalo WHR-HP-G54.
kamikaze_0.7
sd: ScanDisk 512mb

i used the following layout:
SD_CS -> GPIO 1 (Bridge LED)
SD_DO -> GPIO 6 (AOSS LED)
SD_CLK -> GPIO 3 (Uninstalled LED)
SD_DI -> GPIO 5 (Auto/Bridge switch)

i got the src of 1.3.4 and changed the config.h to:

#define LOG_LEVEL 3
#define USE_CMD18
#define USE_CMD25

/* GPIO pin 2 */
//#define SD_DI 0x04
#define SD_DI 0x20
/* GPIO pin 4 */
//#define SD_DO 0x10
#define SD_DO 0x40
/* GPIO pin 3 */
#define SD_CLK 0x08
/* GPIO pin 7 */
#define SD_CS 0x02

#if SD_DO == 0x10
    #define SHIFT_DO 3
#else
#if SD_DO == 0x40
    #define SHIFT_DO 1
#endif
#endif
#if SD_DI == 0x04
    #define SHIFT_DI 5
#else
#if SD_DI == 0x20
    #define SHIFT_DI 2
#endif
#endif

and i always get this message:

[INFO] mmc_hardware_init: initializing GPIOs
[INFO] mmc_card_init: the period of a 380KHz frequency lasts 524 CPU cycles
[INFO] mmc_card_init: powering card on. sending 80 CLK
[INFO] mmc_card_init: 80 CLK sent in 44136 CPU cycles
[INFO] mmc_card_init: resetting card (CMD0)
[FATAL] mmc_card_init: invalid response from card: ff found, waiting for 01
[INFO] mmc_card_init: the period of a 380KHz frequency lasts 524 CPU cycles
[INFO] mmc_card_init: powering card on. sending 80 CLK
[INFO] mmc_card_init: 80 CLK sent in 43306 CPU cycles
[INFO] mmc_card_init: resetting card (CMD0)
[FATAL] mmc_card_init: invalid response from card: ff found, waiting for 01
[ERROR] mmc_init: got an error calling mmc_card_init: 01
[ERROR] mmc_check_media: change detected but was not able to initialize new card: ffffffff

any ideas?

Edit:
i tried the mmc.c from http://wiki.openwrt.org/OpenWrtDocs/Customizing/Hardware/MMC?highlight=%28mmc%29 (1.4)
seems to work, i just mnted the sd card and wrote some stuff
speed suxx like hell ,)

dmesg:

mmc: Device does not use v1 GPIO layout, trying to use v4 layout
mmc: Device does not use v4 layout, trying to use Buffalo layout
Size = 495488, hardsectsize = 512, sectors = 990976
Partition check:
 mmca: p1

Edit:
i tried dd-wrt with mmc, works fijne with manual gpio layout definition
write: 197 kb/s
read: 256 kb/s

dmesg:

mmc: starting module with: SD_DI=0x40, SD_DO=0x20, SD_CLK=0x8, SD_CS=0x2
Size = 495488, hardsectsize = 512, sectors = 990976
Partition check:
 mmca: p1
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended

(Last edited by dotb52 on 23 Feb 2008, 16:38)

how do you test read/write ?

mmc 1.3.4 is ok with SD emet 2Go 60x ~400ko/s read

(Last edited by $@m on 3 Mar 2008, 00:24)

i have wrt54g v2

i connect mmc card to him

i test all gpio with led albo its blinking when i run

while true; do gpio enable 5; sleep 1; gpio disable 5; sleep 1; done

but its little problem if i run "gpio enable 7" (DMZ LED) its turn OFF and if "gpio disable 7" the its ON

maybe this is a problem , card not work

or mmc.o is bad

help

Seems dead. But I don't care for 2.4 kernel any more.

And for 2.6 kernels their is a new mmc-over-gpio driver in the trunk source which works good

Hi
I need mmc driver for gpio 0,6,12 and 14 pins for my wap54g...
I use this howto:http://panteltje.com/panteltje/wap54g/to-linksys-wap54g-forum-2.txt and I'm using soft from this site now, but I have:

Jan  1 00:45:46 (none) daemon.warn klogd: mmc Hardware init
Jan  1 00:45:46 (none) daemon.warn klogd: mmc Card init
Jan  1 00:45:46 (none) daemon.warn klogd: mmc Card init
Jan  1 00:45:46 (none) daemon.warn klogd> > error in mmc_card_init (1)
Jan  1 00:45:46 (none) daemon.warn klogd: mmc: error in mmc_init (-1)

What can I do?
I can't download src for mmc driver.(site is down)
Please help my

(Last edited by dinek889 on 29 Apr 2008, 19:02)

Hey guys!! great work!!

The links seem to be offline or broken... you might wanna check your hosting....it would be really great if you could fix those download links...
or just send me a compiled version of the newest dirver GPIO2 (used this tutorial to make it: http://www.hendlsofen.de/WRT54GL/eng/WRT54GL_SDMod.html) for WRT54GL 1.1 (i would like to use it with kamikaze) on my mail: kantta@gmail.com

Right now i have tired many drivers from different pages, but i have no /dev/mmc/ device in dev directory.... so i would like to use THE drivers!

Cuz that would be just great!!

Hi all,
I'm done this mod on my wap54g:
here is a firmware(with compiled mmc driver - optimized) and howto(gpio: 3,4,6 oraz 7):
http://www.linksys.chyl.org/readarticle.php?article_id=1

Hi everybody.
Do you can explain me how i can use mmc/sd card under Kamikaze 8.09_RC1 with 2.6 kernel?
Previously i use Witerusssian, and everithing work fine,  but now i not have right software ( kernel mod) for use mmc.
I already  install kmod-mmc  but is not work.
kmod-mmc-over-gpio_2.6.25.17-brcm47xx-2_mipsel
kmod-mmc-spi_2.6.25.17-brcm47xx-1_mipsel
kmod-mmc_2.6.25.17-brcm47xx-1_mipsel

Hi

I had many problems running mmc driver in openwrt (no problem in dd-wrt)  on wrt54gl 1.1
now i have kamikaze 8.09 2.4 and latest driver from this topic, everything works but writing is exremely slow
about 30-40 KB/s
i realized that after booting if i unmount mmc partition remove mmc module, load it and mount partition one more time everything is ok, reading and writing times such as others have (32 mb, 1m 18s - write)
so what's wrong with it?
this is my script loading mmc and mounting partiton:
cat /etc/init.d/mountmmc
#!/bin/sh
echo "0x9c" > /proc/diag/gpiomask
insmod mmc
mount /mmc
sleep 8s
swapon /dev/mmc/disc0/part2 -p 5
and /etc/fstab contains (i have modified /etc/config/fstab)
/dev/mmc/disc0/part1    /mmc    ext2    noauto,rw,sync  0       0
it's strange for me, what i did wrong?

ps. mounting swap in this script doesn't work also, why ?

Sorry but can someone upload mmc-bufalo.tgz from http://www.partners.biz/dd-wrt/mmc-buffalo.tar because the site is down
MY configuration is:
3 CLK
6 DO
7 CS
5 DI

Thanks in advance

Compile by yourself.....

hello
i'm integrating the mmc_drv in the 2.6 kernel tree
unfortunately i haven't understand the problem related to the 512Mb limit

i'm using the first release of the mmc_drv (for fonera 2100) that has a limit of the first 512Mb of the mmc/sd card.

What exactly has been modified in that driver to support 1Gb 2Gb ... mmc/sd card ?

/*
* Fonera MMC Driver
*
* 2003-2005 original idea by K. John Crispin, mail john@phrozen.org
*/

(this driver has been used in fonera 2100 mcc
http://www.dd-wrt.com/wiki/index.php/Fonera_SD-Card_hack#MMC_BETA_driver_for_the_LaFonera
http://www.larsen-b.com/Article/262.html)

(Last edited by flamemaniii on 10 Feb 2009, 02:32)

where is it ?

could you post the source ?

(Last edited by flamemaniii on 9 Feb 2009, 21:29)

menuconfig / Kernel modules / Other modules / kmod-mmc-over-gpio

i mean where are sources inside the trunk

ls trunk/package/mmc_over_gpio/files/

.svn/                 
mmc_over_gpio.config 
mmc_over_gpio.init

no .c found

i have to manually include them inside my kernel tree

It's the driver from the Linux Kernel...

ok if you mean the following

/*
* Driver for driving an MMC card over a bitbanging GPIO SPI bus.
*
* 2008 Michael Buesch <mb@bu3sch.de>
*
*/

it has documentation  uc-gentoo-2.6.26.8-fonera/Documentation/gpiommc.txt

i don't like this part

i don't like that cause i have to bootstrap directly with root=/dev/mmc2, so this dynamic mechanism makes me to do an initram where to boot (root=/dev/ram0) and to root_pivot to /dev/mmc2

mmm my question is: is it possible to have a static configuration of the GPIO pins hardly compiled in the kernel ?

(Last edited by flamemaniii on 10 Feb 2009, 02:20)

has anyone got a sd card running with kmod-mmc-over-gpio
how do you use this module? does it use /proc/diag/gpiomask, too? does it work flawless.
want to be sure I can use my sd-card before switching to 2.6.

Yes, but not on Broadcom hardware. One on La Fonera (fon2100) and the other one one a D-Link DIR-300. Both working fine.

i opened this project -> http://www.elinux.org/Flameman/fonera
and a full and complete drive rewrite has been started

(Last edited by flamemaniii on 1 Mar 2009, 01:25)

Hello,

I compiled this driver for kamikaze 8.09 kernel 2.4.35.4

But seams that not working.
I have wrt54gl device working with mmc/sd card in whiterussian and at old past time he works in dd-wrt.

now in kamikaze 8.09  with wrt54gl have:

[INFO] mmc_hardware_init: initializing GPIOs
[INFO] mmc_card_init: the period of a 380KHz frequency lasts 654 CPU cycles
[INFO] mmc_card_init: powering card on. sending 80 CLK
[INFO] mmc_card_init: 80 CLK sent in 53726 CPU cycles
[INFO] mmc_card_init: resetting card (CMD0)
[FATAL] mmc_card_init: invalid response from card: ff found, waiting for 01
[INFO] mmc_card_init: the period of a 380KHz frequency lasts 654 CPU cycles
[INFO] mmc_card_init: powering card on. sending 80 CLK
[INFO] mmc_card_init: 80 CLK sent in 53327 CPU cycles
[INFO] mmc_card_init: resetting card (CMD0)
[FATAL] mmc_card_init: invalid response from card: ff found, waiting for 01
[ERROR] mmc_init: got an error calling mmc_card_init: 01
[ERROR] mmc_check_media: change detected but was not able to initialize new card: ffffffff

I tested this driver because the kmod-broadcom-mmc_2.4.35.4+0.1-brcm-2.4-1_mipsel.ipk was not work.

Please help.