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Implement support for early printf. You need to define SOCDEV_{PA,VA}

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as described in the comments for the eputc function in your config file.
This commit is contained in:
Warner Losh 2014-01-22 21:49:20 +00:00
parent 88b842d215
commit 52e996ac52
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=261040
1 changed files with 18 additions and 0 deletions
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18
sys/arm/at91/uart_dev_at91usart.c
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@ -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.
*/