Hello everyone,
I am designing a custom board with an i.MX6ULL processor with Linux version 4.14.78.
The uuu tool succeed in programming the eMMC with the fsl-image-qt5-validation-imx-imx6ull14x14evk.sdcard.bz2 file by using the USB port. When the board is ready (u-boot loaded and command prompt available on serial link), I plug a USB key but nothing appears (dmesg don't show any change). On previous prototype cards with same hardware the USB key was detected.
With memtool utility I have the following values on the registers PMU_REG_3P00 and PMU_MISC10:
root@imx6ull14x14evk:/# unit_tests/memtool -32 0x020C8120 1
E
Reading 0x1 count starting at address 0x020C8120
0x020C8120: 00011775
root@imx6ull14x14evk:/# unit_tests/memtool -32 0x020C8160 1
E
Reading 0x1 count starting at address 0x020C8160
0x020C8160: 00030000
This values are the same on the working and not working boards. The voltage on VDD_USB_CAP pin is 3.2V as expected. The USB key is supplied with an external +5V regulator.
My question is why USB key is not detected whereas uuu has successfully programmed the eMMC over USB port?
Thank you for your help.
VP
