** Changed in: qemu
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1753314
Title:
UART in sabrelite machine simulation doesn't work with VxWorks 7
Status in QEMU:
Fix Released
Bug description:
The imx_serial.c driver currently implements only partial support for
the i.MX6 UART hardware. (I understand it's a work in progress and
that's fine.) dIn particular, it does not implement support for the
Transmit Complete Interrupt Enable bit in the UCR4 register. The
VxWorks 7 i.MX6 serial driver depends on the behavior of this bit in
actual hardware in order to send characters through the UART
correctly. The result is that with the current machine model, VxWorks
will boot and run in QEMU but it's unable to print any characters to
the console serial port.
I have produced a small patch for the imx_serial.c module to make it
nominally functional with VxWorks 7. It works well enough to allow the
boot banner to appear and for the user to interact with the target
shell.
I'm not submitting this as a patch to the development list as I'm not
fully certain it complies with the hardware spec and doesn't break any
other functionality. I would prefer if the maintainer (or someone)
reviewed it for any issues/refinements first.
I'm attaching the patch to this bug report. A copy can also be
obtained from:
http://people.freebsd.org/~wpaul/qemu/imx_serial.zip
This patch was generated against QEMU 2.11.0 but also works with QEMU
2.11.1.
My host environment is FreeBSD/amd64 11.1-RELEASE with QEMU
2.11.0/2.11.11 built from source.
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