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Technical Questions of SMARC T335X Linux Development

• I'm trying to use SPI master capability of SMARC-T4378. HW setup 1. SMARC-T4378 2. EVK-STD-CARRIER with populated second ETH 3. oscilloscope monitoring at carrier board SPI0.0 SPI0.1 SPI1.0 SPI1.1 SW Many combination tried -The standard kernel from delivered SDCARD - Self build kernel from embedian GIT - it seems that SPI master is enable by default. McSPI is also enabled when I check with menuconfig - arago rootfs tar.gz downloaded from embedian. In user space I can see /dev/spidev2.0 /dev/spidev2.1 /dev/spidev3.0 /dev/spidev3.1 Write to this devices from C returns no error but I dont see any activity on EVM_STD_CARRIER SPI connectors. Comments, suggestion, remarks are welcome. Thanks in advance, Mirtcho Maglijanov
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• Kernel version? What kernel version do you suggest to use?
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• How can I check status of pinmux of some AM335x pin?
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• LCD resolutions: How could I change the LCD resolutions and other parameters?
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• USB WiFi Dongle Driver: I'm not able to build the RTL8192C USB module driver. I need a module (.ko) file that I can load into the kernel to support my WiFi USB device.
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• GPIO device busy error: We are having trouble accessing the GPIO on the SMARC carrier board from the kernel v3.2. Are they somehow disabled? # echo 7 > /sys/class/gpio/export that gives me the device busy error.
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• Firmware Preload: When we reach production, and are ordering the SMARC modules from you, will they come pre-loaded with U-boot? Or should we be preparing the capability to connect to the JTAG on the module?
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