Hello,
I have connected UART1 (ttyS1) to a third party board and set the device tree as follow :
verbosity=7
fdtfile=rockchip/rk3328-rock-pi-e.dtb
overlays=rk3328-uart2 rk3328-uart1
rootuuid=2dbe2a8e-210d-42f8-80de-d397f4fe9bc4
initrdsize=0x80ca06
kernelversion=4.4.194-21-rockchip-g12a182552739
initrdimg=initrd.img-4.4.194-21-rockchip-g12a182552739
kernelimg=vmlinuz-4.4.194-21-rockchip-g12a182552739
Unfortunately after few working hours rockpi e freezes. After several checkings and when using dmesg | grep tty command i get this:
dmesg | grep tty
[ 0.000000] Kernel command line: initrd=initrd.img-4.4.194-21-rockchip-g12a182552739 root=UUID=2dbe2a8e-210d-42f8-80de-d397f4fe9bc4 rootwait rw rootfstype=ext4 console= tty 1 console= panic=10 consoleblank=0 loglevel=7 cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory swapaccount=1
[ 0.003012] console [ tty 1] enabled
[ 0.154584] Registered FIQ tty driver
[ 1.153376] ff120000.serial: tty S1 at MMIO 0xff120000 (irq = 12, base_baud = 1500000) is a 16550A
[ 1.154449] ff130000.serial: tty S2 at MMIO 0xff130000 (irq = 13, base_baud = 1500000) is a 16550A
[ 12.292390] tty S1 - failed to request DMA, use interrupt mode
How can i solve ttyS1 problem?
thank you in advance