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Allwinner: Add EARLY_PRINTF function

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EARLY_PRINTF can help debugging early problems.
Add it for Allwinner SoCs.

Tested On: OrangePi One (H3)
This commit is contained in:
Emmanuel Vadot 2017-10-19 20:56:30 +00:00
parent 7707483a07
commit 3e8d2879c6
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=324773
1 changed files with 23 additions and 0 deletions
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23
sys/arm/allwinner/aw_machdep.c
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@ -164,6 +164,29 @@ allwinner_cpu_reset(platform_t plat)
while (1);
}
/*
* To use early printf on Allwinner SoC, add to kernel config
* options SOCDEV_PA=0x01C00000
* options SOCDEV_VA=0x10000000
* options EARLY_PRINTF
* And remove the if 0
*/
#if 0
#ifdef EARLY_PRINTF
static void
allwinner_early_putc(int c)
{
volatile uint32_t * UART_STAT_REG = (uint32_t *)0x1002807C;
volatile uint32_t * UART_TX_REG = (uint32_t *)0x10028000;
const uint32_t UART_TXRDY = (1 << 2);
while ((*UART_STAT_REG & UART_TXRDY) == 0)
continue;
*UART_TX_REG = c;
}
early_putc_t *early_putc = allwinner_early_putc;
#endif /* EARLY_PRINTF */
#if defined(SOC_ALLWINNER_A10)
static platform_method_t a10_methods[] = {
PLATFORMMETHOD(platform_attach, a10_attach),