Received data available interrupt enabled (and 16550 has FIFO full or time-out) Modem-status interrupt enabled (see these on Port 6) Port 1 0x3F9 - (R/W) interrupt enables (Port 3 Bit 7 "DLAB" = 0) Port 0 0x3F8 - (R/W) Data register (Port 3 Bit 7 "DLAB" = 0) or lowīyte of baud-rate divisor. There are 8 ports beginning at 0x3F8, 0x2F8, or elsewhere, for each serial Sections 2, 4, and 5 in the unix manuals and skip right to In that case, if on some kind of Unix, go look up And if you are working with non PC hardware it will Source (located in a file such as /usr/src/linux/drivers/char/serial.c) some of this Of course, if you are doing ioctl(2) calls with Linux, all this is basically handled by theĭriver in the kernel, so it may serve as a reference. The programming interface seems to be much The main improvements have been longer receiver queues in the chip, Or there may be highly integrated ASICs whose UART section works the same as The 8250 and descendant chips in the PCs. La Frite should start booting off eMMC and load Ubuntu.Īfter I did this and ran the commands in the document linked in the OP, my loopback test was successful.Serial port interfacing 4. Once ethearealOS is booted, run the following commands: mount /dev/sda1 /media.(note, some keyboards may act funny navigating the menu if this happens for you, tap the CTRL key after pressing the arrow key) From the boot menu, select the EtherealOS option.Power on the La Frite, and as soon as the keyboard gets power start tapping the escape key.Plug the USB stick and a keyboard into the La Frite, and connect the HDMI to a display.Now, the technique I finally used to install the Ubuntu image only works if the La Frite firmware is up-to-date, so do that first. Part of my problem was the USB stick itself, a 128GB drive made by “onn”, which apparently draws too much power and caused error “read/64, -110” which is apparently Linux Kernel-ese for “too much power draw.”.The Libre images are pre-installed, which means there’s no simple way to transfer the Ubuntu install from the USB stick onto the eMMC.This ended up being a pretty big waste of time, for a few reasons: I’ll post the long version for posterity and to help anyone else trying to install Ubuntu onto the eMMC via a Mac.įirst, I tried flashing the Ubuntu image onto a USB drive and booting from it. The short version is: installing the libre ubuntu and using the libretech wiring tool did the trick. However, if I type “hello” and press enter, I see nothing. run minicom -baudrate 57600 -device /dev/ttyAML6 -8 in another sessionĪfter doing this, I expect to be able to type in one minicom session and see the text in the other.run minicom -baudrate 57600 -device /dev/ttyUSB0 -8 in one session.USB → one of the USB ports (I’ve tried both).
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