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The units are "MTUs," not "bytes." With this in mind, we can burst the
minimum number of buffers.
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The memory ordering ensures that operations to normal memory are
synchronized with operations on device memory, at runtime. I've seen
this play out in the transmit path: writes to the transmit buffer's
flags weren't reaching memory by the time the MAC was checking,
resulting in missing packets. Moving the fence works, but it's better to
use atomics.
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A prototype of an i.MX RT ENET driver. There's design decisions I'm
thinking of changing. Nevertheless, the smoltcp support seems to be
working; an 1170EVK can act as a DHCP client and a TCP loopback server.
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