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author | ian <ian@FreeBSD.org> | 2014-05-14 22:52:16 +0000 |
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committer | ian <ian@FreeBSD.org> | 2014-05-14 22:52:16 +0000 |
commit | 393ed120ae54ade20f39ff2e4182685fc0324b23 (patch) | |
tree | 82bb227fb3ce470f6dbd94def90c7e383255e50b /sys/arm/at91 | |
parent | 1e57c2fe05cab95009d814e0c9450938bd589b94 (diff) | |
download | FreeBSD-src-393ed120ae54ade20f39ff2e4182685fc0324b23.zip FreeBSD-src-393ed120ae54ade20f39ff2e4182685fc0324b23.tar.gz |
MFC r261038, r261039, r261040, r261041
Implement generic support for early printf.
Diffstat (limited to 'sys/arm/at91')
-rw-r--r-- | sys/arm/at91/uart_dev_at91usart.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/sys/arm/at91/uart_dev_at91usart.c b/sys/arm/at91/uart_dev_at91usart.c index 6ba7736..d16f239 100644 --- a/sys/arm/at91/uart_dev_at91usart.c +++ b/sys/arm/at91/uart_dev_at91usart.c @@ -276,6 +276,24 @@ at91_usart_putc(struct uart_bas *bas, int c) WR4(bas, USART_THR, c); } +#ifdef EARLY_PRINTF +/* + * Early printf support. This assumes that we have the SoC "system" devices + * mapped into AT91_BASE. To use this before we adjust the boostrap tables, + * You'll need to define SOCDEV_VA to be 0xdc000000 and SOCDEV_PA to be + * 0xfc000000 in your config file where you define EARLY_PRINTF + */ +volatile uint32_t *at91_dbgu = (volatile uint32_t *)(AT91_BASE + AT91_DBGU0); + +void +eputc(int c) +{ + while (!(at91_dbgu[USART_CSR / 4] & USART_CSR_TXRDY)) + continue; + at91_dbgu[USART_THR / 4] = c; +} +#endif + /* * Check for a character available. */ |