Subject: serial connection on debian on sun ultra10

I try iso "debian-9.0-sparc-netinst" (last) to boot on Ultra10
adding kernel param: console=ttyS0,9600,8n1 keep_bootcon=1

I have a cable usb<--->serial with a Mac-mini-g4 (lubuntu 16.04)
and running "minicom -s" configured with: /dev/ttyUSB0, 9600 8n1

I view only this on console/minicom:

what I wrong?
what do you suggest to me?



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