Hi everyone, I'm trying to implement a fat file system on sd card I followed the instructions for Altera SPI Core on this page http://www.nioswiki.com/operatingsystems/uclinux/mmcsd didn't work... was I suppose to use SPI (3 wire) IP? thanks, Asaf

Yep. Using the fast (nonSPI) SD-Card interface interface requires joining the SD-Card Organization and paying money for the license. So you need to stick with the slow SPI interface, unless you want to do so. There are commercial SD-Card IP-Cores available that enable the use of this interface. -Michael

thanks but I'm into the free stuff :) maybe I configured somthing wrong in the IP...

Hi, --- Quote Start --- Hi everyone, http://www.nioswiki.com/operatingsystems/uclinux/mmcsd didn't work... --- Quote End --- What claims does your kernel say? Kazu

well, I'm still stuck I thought I'd see something like this --- Quote Start --- Freeing unused kernel memory: 676k freed (0x1f6000 - 0x29e000) mmc0: new SD card on SPI mmcblk0: mmc0:0000 TWTTI 124672KiB mmcblk0: p1 p2 --- Quote End --- on boot, as ashown in nioswiki so I thought of a few possible problems 1. pin assignments 2. IP core not configured as should 3. driver not loaded now I'm down to either it's an IP problem or driver problem so just to make sure again it is Altera's SPI (3 wire interface) IP, right? not someone else's similar IP? and if so could someone show me the right configuration? Thanks again, Asaf

I just recently went through getting the SD card working on my DE2-70 board and was able to finally mount my 4 GB SD card with a standard vfat file system. Here's what I did, let us know if this helps you get yours working... 1) I started my project by using the DE2_70_NET project found on Terasic's DE2-70 CD freely available on their site. I'd start with that if you happen to be using that board. In any case, it might be a good reference. I had to remove the GPIO pins they used for SD card access as it's not compatible with the uClinux MMC/SD/SDIO over SPI driver. Then I added a new component "SPI (3 wire serial)" to my SOPC builder design called mmc_spi (I think the name matters as uClinux drivers look for it) at base address 0x09606000 (address probably doesn't matter as long as there's no conflict). 2) I had to change the assignment of pins in the top level design (DE2_70_NET.v), removing references to SD_* components which no longer exist, and adding the following lines starting at 549 (seemed like a good place)... Line 549: // the_mmc_spi (SD Card Slot) Line 550: .SCLK_from_the_mmc_spi(oSD_CLK), Line 551: .MOSI_from_the_mmc_spi(SD_CMD), Line 552: .MISO_to_the_mmc_spi(SD_DAT), Line 553: .SS_n_from_the_mmc_spi(SD_DAT3), Then I compiled the design. 3) Changes to the Kernel config: (Anything not explicitly shown as added was kept as is, if it was added by default I left it alone and didn't remove it) -- forgive underscores here, I can't get this forum to properly indent with whitespace --> Device Drivers ___ * --> SPI Support _________* Altera SPI Controller --> Device Drivers ____* --> mmc/SD/SDIO Support _________* mmc/SD/SDIO over SPI --> File Systems ___--> Native Language Support _______* Codepage 437 (US, Canada) _______* NLS ISO 8859-1 (Latin 1... 4) Recompiled the kernel. 5) Booted the design. If things went well, you should see something like this as your kernel boots (without a card installed)... mmc_spi spi2.0: ASSUMING SPI bus stays unshared! mmc_spi spi2.0: ASSUMING 3.2-3.4 V slot power mmc_spi spi2.0: SD/MMC host mmc0, no DMA, no WP, no poweroff <No further mmc_sip messages at bootup> With my 4 GB SD card inserted it'll look like this... mmc_spi spi2.0: ASSUMING SPI bus stays unshared! mmc_spi spi2.0: ASSUMING 3.2-3.4 V slot power mmc_spi spi2.0: SD/MMC host mmc0, no DMA, no WP, no poweroff <A few other lines of booting messages> mmc0: host does not support reading read-only switch. assuming write-enable. mmc0: new SDHC card on SPI mmcblk0: mmc0:0000 SD04G 3.69 GiB mmcblk0:Command: mount -t proc proc /proc -o noexec,nosuid,nodev p1 Then at the command prompt provided mount is in your kernel's app config somewhere (I think it is by default?) just type the following... /> mount -t vfat /dev/mmcblk0p1 /mnt /> ls -l /mnt drwxrwxrwx 3 root root 4096 Oct 17 2009 FPGADev drwxrwxrwx 2 root root 4096 Nov 29 16:04 NewFolder -rwxr-xr-x 1 root root 20 Nov 2 2009 newerfile.txt /> Hopefully that'll show you what's on your SD card! I hope this helps you out. Good Luck!

mounting SD Card on uClinux | Altera Community

37 Replies

Altera_Forum
Honored Contributor
16 years ago
I have the same problem，don't know how to handle it.
just display the message above ,no other messages,who can give me helps?
:
mmc_spi spi2.0: ASSUMING SPI bus stays unshared!
mmc_spi spi2.0: ASSUMING 3.2-3.4 V slot power
mmc_spi spi2.0: SD/MMC host mmc0, no DMA, no WP, no poweroff
Altera_Forum
Honored Contributor
16 years ago
... This output seems OK. What is the problem ?
-Michael
Altera_Forum
Honored Contributor
16 years ago
mmc_spi spi2.0: ASSUMING SPI bus stays unshared!
mmc_spi spi2.0: ASSUMING 3.2-3.4 V slot power
mmc_spi spi2.0: SD/MMC host mmc0, no DMA, no WP, no poweroff
...

but when I try to moun it

/> mount -t vfat /dev/mmcblk0p1 /mnt
mount: mounting /dev/mmcblk0p1 on /mnt failed: No such device or address

I have insert 4GB SDcard，but cannot found the message above and cannot mount it.
————————————————————————————————
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SDHC card on SPI
mmcblk0: mmc0:0000 SD04G 3.69 GiB
mmcblk0:Command: mount -t proc proc /proc -o noexec,nosuid,nodev
p1
——————————————————————————————————
Altera_Forum
Honored Contributor
16 years ago
(using the drivers as modules), to allow for Linux and Windows formatted cards, which uses different partition tables)I do this:

modprobe mmc_block
modprobe mmc_spi# sd card formatted by Windows (no parition table)
mount -t vfat /dev/mmcblk0 /mnt/sdcard# sd card formatted by Linux (first parition)
mount -t vfat /dev/mmcblk0p1 /mnt/sdcard
Altera_Forum
Honored Contributor
16 years ago
I want know why after I use nios2-terminal command, I cann't see the display messages above,is the hardware problem or pin assign problem?
"mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SDHC card on SPI
mmcblk0: mmc0:0000 SD04G 3.69 GiB
mmcblk0:Command: mount -t proc proc /proc -o noexec,nosuid,nodev
"

DO you means that I should download the zImage and mmc_block.o and mmc_spi.o at first ?and modprobe mmc_block and mmc_spi ?
I make zImage with mmc_block.o and mmc_spi.o.

"nios2-linux/uClinux-dist/linux-2.6.x/drivers/mmc/host/mmc_spi.o"
"nios2-linux/uClinux-dist/linux-2.6.x/drivers/mmc/card/mmc_block.o"
Altera_Forum
Honored Contributor
16 years ago
Sorry. Most of your messagge does not make sense to me. Please rephrase.

I suppose the "Read only switch" is not supported by the hardware.

-Michael
Altera_Forum
Honored Contributor
16 years ago
again:

At first, after command nios2-download and nios2-terminal,just display "
mmc_spi spi2.0: ASSUMING SPI bus stays unshared!
mmc_spi spi2.0: ASSUMING 3.2-3.4 V slot power
mmc_spi spi2.0: SD/MMC host mmc0, no DMA, no WP, no poweroff
...
" no other message as

"mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SDHC card on SPI
mmcblk0: mmc0:0000 SD04G 3.69 GiB
mmcblk0:Command: mount -t proc proc /proc -o noexec,nosuid,nodev
"

follow your suggestion ,I have donwnload zImage , mmc_block.o and mmc_spi.o,and modporbe it ,but display errors like
:modprobe : chdir <2.6.30>no such file or directory.
Altera_Forum
Honored Contributor
16 years ago
I see this:

==========================================================
Command: mkdir /mnt/sdcard
Command: /etc/mount_sdcard
Shell invoked to run file: /etc/mount_sdcard
Command: modprobe mmc_block
Command: modprobe mmc_spi
mmc_spi spi2.0: ASSUMING SPI bus stays unshared!
mmc_spi spi2.0: ASSUMING 3.2-3.4 V slot power
mmc_spi spi2.0: SD/MMC host mmc0, no DMA, no WP, no poweroff
Command: mount -t vfat /dev/mmcblk0 /mnt/sdcard
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SD card on SPI
mmcblk0: mmc0:0000 121 MiB
mmcblk0:
Command: mount -t vfat /dev/mmcblk0p1 /mnt/sdcard
mount: mounting /dev/mmcblk0p1 on /mnt/sdcard failed: No such device or address
Execution Finished, Exiting
=============================================================

Thus mmcblk0 is mounted, while mounting /dev/mmcblk0p1 fails, as this is a Windows-formatted SD-Card without a partition table.

-Michael
Altera_Forum
Honored Contributor
16 years ago
why I cannt see the message at the process of uclinux startup?
like
"
Command: mount -t vfat /dev/mmcblk0 /mnt/sdcard
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new SD card on SPI
mmcblk0: mmc0:0000 121 MiB
mmcblk0:
Command: mount -t vfat /dev/mmcblk0p1 /mnt/sdcard
mount: mounting /dev/mmcblk0p1 on /mnt/sdcard failed: No such device or address
Execution Finished, Exiting
"

and when I typed "mount -t vfat /dev/mmcblk0 /mnt/sdcard "
also display "No such device or address
"
Altera_Forum
Honored Contributor
16 years ago
we know than :(
-Michael

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mounting SD Card on uClinux

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