topic Re: 8-bit eMMC interface in i.MX Processors

8-bit eMMC interface

shwethanarayan — Fri, 12 Mar 2021 07:27:08 GMT

Hi NXP team,

We are using i.MX 6 processor MCIMX6G3CVM05AB for one of our project.

Can we connect this 8-bit eMMC to ushdc-2(SD2 ) interface. We are using this eMMC as the primary booting option.

Also can we use UUU to flash the eMMC? What changes need to be done?

Please let me know your feedback.

Regards

Shwetha

joanxie — Fri, 12 Mar 2021 08:41:14 GMT

refer to the Table 5-6. MMC/eMMC Boot Fusemap of imx6ul reference manual, BOOT_CFG2[5-7] can choose bus width:

Bus Width:
000 - 1-bit
001 - 4-bit
010 - 8-bit
101 - 4-bit
DDR (MMC 4.4)
110 - 8-bit
DDR (MMC 4.4)
Else - Reserved

then try the patch to support 8bit emmc

diff --git a/include/configs/mx6ul_14x14_evk.h b/include/configs/mx6ul_14x14_evk.h

index aabe2f7..b05b71f 100644

--- a/include/configs/mx6ul_14x14_evk.h

+++ b/include/configs/mx6ul_14x14_evk.h

@@ -426,4 +426,6 @@

#include "mx6ul_14x14_evk_android.h"

#endif

+#define CONFIG_MX6UL_EVK_EMMC_REWORK

#endif

shwethanarayan — Fri, 12 Mar 2021 10:09:59 GMT

Hi NXP Team,

Thanks for the reply.

Our custom board has iMX 6 processor MCIMX6G3CVM05AB.

Please answer my below questions with YES or NO.

1. Can we connect this 8-bit eMMC to ushdc-2(SD2 ) interface?

2.Also can we use UUU to flash the eMMC mentioned in question 1?

Regards

Shwetha

shwethanarayan — Thu, 18 Mar 2021 11:51:49 GMT

Hi Team,

Can anybody answer me on this query.

We are using i.MX 6 processor MCIMX6G3CVM05AB for one of our project.

Can we connect this 8-bit eMMC to ushdc-2(SD2 ) interface. We are using this eMMC as the primary booting option.

Also can we use UUU to flash the eMMC? What changes need to be done?

Please let me know your feedback.

Regards

Shwetha

joanxie — Sat, 20 Mar 2021 04:55:24 GMT

did you see my patch? this is for how to support 8bit emmc the answer is yes of course