I have an identical problem but with the LS1046A Reference Design Board:
Cannot connect via serial port connect to the LS1046A RDB, when I connect the console USB to my Windows 10 workstation, I only see a drive labeled "BOOTLOADER" containing one file called bootload.htm, using Windows10 and did not previously disable Windows service 'Storage Services'.
I looked all over for and mbed binary compatible with the LS1046A-RDB and have not found it, is the binary posted above k22fx512_ls1020a_if_mbed.bin.zip in the entry dated Jul 11, 2017 3:50 AM compatible with the LS1046A?
Can someone post the mbed binary for the LS1046A-RDB?