[#3947] BF54x SDH/MMC not functional
Submitted By: Michael Hennerich
2008-02-29 08:20:41 Close Date
Medium High Assignee:
Closed Fixed In Release:
Found In Release:
BF548 Silicon Revision:
Is this bug repeatable?:
Uboot version or rev.:
Toolchain version or rev.:
App binary format:
Summary: BF54x SDH/MMC not functional
On 2008R1 as well as on svn trunk BF54x SDH driver is not functional.
Quick hint: NFC/NAND mtd driver needs to turned off, because SDH and NFC share the same DMA channel.
--- Vivi Li 2008-03-10 00:05:22
What did you mean by not functional? For the past weeks I reported serveral bugs
of SDH. Please refer to bug 3925/3960/3961. NAND mtd driver is default to be
enabled when I test.
Attached are the latest auto test result and the config file.
--- Michael Hennerich 2008-03-10 07:43:52
>What did you mean by not functional?
None of the card gets recognized.
And I don't get this kmesg line:
mmcblk0: mmc0:e624 SD01G 992000KiB
mmcblk0: p1 p2
>NAND mtd driver is default to be
enabled when I test.
Impossible - also your config has NFC NAND support turned off.
I tested here using your config file - no difference.
The only difference here - I test on the latest BF548-Ezkit using Silicon Rev
As soon I get my old EZkit back I will run the image I build there.
--- Vivi Li 2008-03-10 22:38:51
First, have you soldered a resistor to 548 borad? SDH can't detect inserted card
without adding this resistor. Roy ever gave a comment about this in
Second, I'm using board version 1.1 for testing.
--- Michael Hennerich 2008-03-11 06:22:26
I would expect that on the 1.3 Rev of the BF548-EZkit, I don't need to do any
HW modifications. In case there was issue on the 1.1 Rev, this should have been
reported to the tools group.
I also expect that you test on the latest 1.3 Rev. of the board, because this
is the board everyone can buy / uses.
Do you have more information about the HW mods on your board?
--- Vivi Li 2008-03-12 04:35:07
I have tried SDIO on 1.3 Rev of BF548-EZkit and it failed to detect MMC card.
I'll solder a resistor to it and try again.
We only got one board of 1.3 Rev of BF548-EZKIT for developers, so now we are
using Rev. 1.1 for testing.
--- Vivi Li 2008-03-12 06:27:06
For BF548-EZKIT Rev. 1.3, I solder a 10k resistor to it and MMC/SD cards can be
--- Michael Hennerich 2008-03-12 08:15:26
Thanks - to which signal / pin did you solder the resistor?
--- Sonic Zhang 2008-03-12 22:21:12
Robin, do you know whom in the hardware team can we report this board bug to?
--- Vivi Li 2008-03-12 23:41:06
The 10K resistor is soldered between two pins of SD MEMORY CONNECTOR J5:
3rd pin(the one connected to R170) and 5th pin(near C132) from right side.
On schematic, they are pin 2 and 4 of J5.
--- Michael Hennerich 2008-03-13 08:17:10
Ok - I looked a bit into the driver.
ios->bus_mode == MMC_BUSMODE_OPENDRAIN
The driver sets SD_CMD_OD in the SDH_PWR_CTL register.
This turns the CMD pin into an Open Drain output - however we don't have a Pull
Up on the board.
The VDSP drivers doesn't set SD_CMD_OD, so the issue for them goes unnoticed.
If I don't set SD_CMD_OD the driver works fine.
The question now - should we workaround a HW modification by simply not setting
I don't have a SDIO spec at hand - so I can't tell what exactly is the story
behind CMD Open Drain.
--- Sonic Zhang 2008-03-18 00:12:10
Fixed by Michael.
--- Vivi Li 2008-03-18 06:53:54
So close it.
File Name File Type File Size Posted By
config.sdiommc text/plain 31074 Vivi Li
sdiommc_test_log text/plain 26409 Vivi Li