d8927f1396
Make serial ports more robust and reliable. Make non-console ports work. This might have broken skyeye stuff. o Introduce ping-pong receive buffers. o Use DMA to copy characters directly into memory. o Support baud rates other than 115200 o Use 1 stop bit when 1 stop bit is requested (otherwise 2 were used, which caused dropped characters when received in bursts). o Use 1.5 stop bits for 5-bit bytes, and 2 stop bits otherwise when 2 stop bits were requested. o Actually update line parameters. o Fix comments o Move init into attach o Tweaks to TX interrupt registers to get them reliable and non-storming. o harvest data in ipend since the latency between it and the callback was too long. This likely is how it should be, I don't know why I deferred things to the callback before. o disable all interrupts in console init. We don't want interrupts until we turn on an ISR. o cosmetic tweaks o Automatically detect of the TIMEOUT interrupt is supported. If so, use it so we get better CPU utilization. Otherwise do a character at a time RX. Good news here is that it seems we have enough CPU and low enough fast interrupt latency to do this reliably. o Don't read USART_CR. It is a write-only register. o start to implement bus_ioctl. Do BAUD now...
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