RCC-VE-2440 No Serial Output
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$ sudo /usr/bin/screen /dev/cu.SLAB_USBtoUART 115200Blank screen with no error messages, and no response to any input. Same result if I pass screen
-U, and also same result withcu -s 115200 /dev/cu.SLAB_USBtoUART.$ sw_vers ProductName: Mac OS X ProductVersion: 10.14.6 BuildVersion: 18G95 $ uname -rsv Darwin 18.7.0 Darwin Kernel Version 18.7.0: Tue Aug 20 16:57:14 PDT 2019; root:xnu-4903.271.2~2/RELEASE_X86_64 $ ls /dev | grep cu.SLAB cu.SLAB_USBtoUART $ kextstat | grep silab 171 0 0xffffff7f83c1b000 0x9000 0x9000 com.silabs.driver.CP210xVCPDriver (5.2.4) 79BD054F-7A71-34DE-9763-59D44DAC0615 <89 23 5 3> $ /usr/bin/screen --version Screen version 4.00.03 (FAU) 23-Oct-06 $ env TERM=xterm-256color TERM_PROGRAM=Apple_Terminal TERM_PROGRAM_VERSION=421.2 # ... snip ... $ sudo kextutil -v /Library/Extensions/SiLabsUSBDriver.kext/ Defaulting to kernel file '/System/Library/Kernels/kernel' /Library/Extensions/SiLabsUSBDriver.kext appears to be loadable (not including linkage for on-disk libraries). Loading /Library/Extensions/SiLabsUSBDriver.kext. /Library/Extensions/SiLabsUSBDriver.kext successfully loaded (or already loaded). $ ioreg -p IOUSB +-o Root <class IORegistryEntry, id 0x100000100, retain 15> +-o AppleUSBXHCI Root Hub Simulation@14000000 <class AppleUSBRootHubDevice, id 0x1000003db, registered, matched, active, busy 0 (0 ms), retain 13> +-o Apple T1 Controller@14100000 <class AppleUSBDevice, id 0x1000003dd, registered, matched, active, busy 0 (1 ms), retain 34> +-o CP2104 USB to UART Bridge Controller@14600000 <class AppleUSBDevice, id 0x10000091a, registered, matched, active, busy 0 (8 ms), retain 14>Any ideas on where to go from here?
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You should see some output from Coreboot when you first power it up on the serial console even if you have no OS installed.
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