Messages in this thread | | | Date | Fri, 7 Dec 2012 10:04:38 +0000 | From | Alan Cox <> | Subject | Re: 8250 UART doesn't work |
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> The UART controller is EXAR ST16C554D. It claims as a 16550 > compatible controller. Each ST16C554D module contains 4 UART, each of > them can be selected via two chip select pad. I think the board > hardware, via a CPLD, make the chip selection transparent to the CPU, so > by a 5-bit address, CPU can addressing individual 8 16550 compatible > registers of each UART.
The EXAR should work. Make sure you have all the addressing and setup right would be my first suggestion - then poke at the registers by hand and double check.
Alan
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