Issue on eMMC boot with imx6sx

[jingyangxie]

Hi,all

     we have a problem with boot on emmc，when I use mfgtool(linux 3.14.52) to download the image ,the ternimal logged as followed:

   sdhci: Tuning procedure failed, falling back to fixed sampling clock
   mmc3: tuning execution failed
   mmc3: error -5 whilst initialising MMC card
   mmc3: BKOPS_EN bit is not set
   mmc3: tuning execution failed
   mmc3: error -5 whilst initialising MMC card

can anyone have the same problem?

[igorpadykov]

Hi  jingyang

tuning is used for emmc v.4.5, 5.0, one can check if signal levels

are 1.8V and complies with datasheet sect.4.12.5.4 HS200 Mode Timing

i.MX6SX Datasheet
https://www.nxp.com/docs/en/data-sheet/IMX6SXCEC.pdf

Signal shape may be tweaked changing pad settings in pinctrl_usdhc4_1_200mhz

linux/arch/arm/boot/dts/imx6sx-sdb-emmc.dts

linux-imx.git - i.MX Linux Kernel 

Best regards
igor
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[jingyangxie]

Hi,igor

   thanks for your answer,the board now can recognize the emmc(in sd4),but the download cannot be finished ,it stoped at "cpu id  is 0",there are some message:

mmc3: new HS200 MMC card at address 0001
mmcblk3: mmc3:0001 P1XXXX 7.20 GiB
mmcblk3boot0: mmc3:0001 P1XXXX partition 1 2.00 MiB
mmcblk3boot1: mmc3:0001 P1XXXX partition 2 2.00 MiB
mmcblk3rpmb: mmc3:0001 P1XXXX partition 3 128 KiB
mmcblk3: unknown partition table
mmcblk3boot1: unknown partition table
mmcblk3boot0: unknown partition table
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
TCP: cubic registered
NET: Registered protocol family 10
sit: IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
Key type dns_resolver registered
cpu cpu0: dev_pm_opp_get_opp_count: device OPP not found (-19)
Registering SWP/SWPB emulation handler
SWBST: disabling
usb_otg1_vbus: disabling
VCC_SD3: disabling
regulator-dummy: disabling
imx mcc test is registered.
Number of LUNs=8
Mass Storage Function, version: 2009/09/11
LUN: removable file: (no medium)
Number of LUNs=1
LUN: removable file: (no medium)
Number of LUNs=1
g_mass_storage gadget: Mass Storage Gadget, version: 2009/09/11
g_mass_storage gadget: g_mass_storage ready
snvs_rtc 20cc034.snvs-rtc-lp: setting system clock to 1970-01-01 00:00:00 UTC (0)
ALSA device list:
No soundcards found.
Freeing unused kernel memory: 380K (808bd000 - 8091c000)
Starting UTP
uuc 0.5 [built Dec 3 2015 08:26:46]
UTP: Waiting for device to appear
UTP: file/device node /dev/utp already exists
cpu_id is 0

[igorpadykov]

Hi  jingyang

please check that usb_id is floating or high.

Best regards
igor

[jingyangxie]

Hi,igor

    I check that the usb_id is floating,and the voltage is 3.3V,is there any possibility which cause the download process stopped at "cpu_id is 0"?

[jingyangxie]

the problem is solved

[wenbochen]

Hi, Jingyang Xie, I have the same problem as yours, so, can you tell me how to solve it? Thanks. 

[jingyangxie]

Hi,wenbo

which problem did you have?

[wenbochen]

Hi jingyang, the problem is that, when I burn image on imx6q-sabresd using MFGtools, but it stop here: 

Freeing unused kernel memory: 296K (80bdf000 - 80c29000)
Starting UTP
mknod: /dev/tty0: File exists
ln: /etc/mtab: File exists
disable turn off display
Starting udev
udevd[158]: starting version 182
uuc 0.4 [built Apr 5 2014 08:45:57]
UTP: Waiting for device to appear
UTP: file/device node /dev/utp already exists
cpu_id is 0

I have no idea about this, can u give me some help ? :smileyhappy:

[jingyangxie]

我之前遇到这个问题是硬件问题，把OTG电路里面的某个电阻拆掉了，这个硬件工程师处理的，我问他，他完全忘了，不好意思哈

[wenbochen]

不过还是要谢谢，我这板子可以下载原厂的其他内核，我新编译的内核却下载不了，估计是软件设置的问题，和您的不一样，我再查查资料把。 :smileyhappy:

[jingyangxie]

在firmware里面放原版内核，在files里面放新编译的内核，应该可以烧进去

jingyang xie

邮箱：17702710280@163.com

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[wenbochen]

您好，刚刚尝试了一下，串口输出内容如下：

首先是原版的firmware所有文件：

......

mmc2: unrecognised EXT_CSD revision 7

mmc2: error -22 whilst initialising MMC card

mmc2: unrecognised EXT_CSD revision 7

mmc2: error -22 whilst initialising MMC card

Galcore version 4.6.9.9754

mmc2: unrecognised EXT_CSD revisio

[jingyangxie]

你不是说原版的可以下进去吗？

jingyang xie

邮箱：17702710280@163.com

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[wenbochen]

hi，尝试多次可下载成功，但是又出现  Waiting for root device /dev/mmcblk3p2， 需要另外找资料了。:)

[jingyangxie]

嗯嗯，只要硬件没什么问题，这个下载还是比较简单的

[wenbochen]

不好意思哈，表达有误。

之前我说的原版的是这个板子原厂的，内核是3.0.35。

刚刚您说的原版的是下载mfgtool时一起的那个uImage吗？

那现在我再试试原厂给的uImage，发现还是不行，直接在“Galcore version 4.9.2.9754” 处停止。

[jingyangxie]

你是用mfgtool下载的吗？

jingyang xie

邮箱：17702710280@163.com

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[wenbochen]

是的，从官网下的针对3.10.17的mfgtool。