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serial/ns16550: wait for TEMT before initializing
TEMT is set when the transmitter is totally empty and all output has finished. This prevents output problems (including a loss of synchronization observed on p2020 that persisted for quite a while) if SPL has output still on its way out. Signed-off-by: Scott Wood <scottwood@freescale.com> -- v2: fixed typo in subject, and explained what the bit does in the changelog
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@ -36,6 +36,9 @@
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void NS16550_init(NS16550_t com_port, int baud_divisor)
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void NS16550_init(NS16550_t com_port, int baud_divisor)
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{
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{
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while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
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;
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serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
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serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
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#if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \
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#if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \
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defined(CONFIG_AM33XX)
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defined(CONFIG_AM33XX)
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