Date: Thu, 19 Oct 2017 20:56:30 +0000 (UTC) From: Emmanuel Vadot <manu@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r324773 - head/sys/arm/allwinner Message-ID: <201710192056.v9JKuUpQ050752@repo.freebsd.org>
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Author: manu Date: Thu Oct 19 20:56:30 2017 New Revision: 324773 URL: https://svnweb.freebsd.org/changeset/base/324773 Log: Allwinner: Add EARLY_PRINTF function EARLY_PRINTF can help debugging early problems. Add it for Allwinner SoCs. Tested On: OrangePi One (H3) Modified: head/sys/arm/allwinner/aw_machdep.c Modified: head/sys/arm/allwinner/aw_machdep.c ============================================================================== --- head/sys/arm/allwinner/aw_machdep.c Thu Oct 19 20:54:55 2017 (r324772) +++ head/sys/arm/allwinner/aw_machdep.c Thu Oct 19 20:56:30 2017 (r324773) @@ -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),
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