Date: Thu, 20 Feb 2014 14:29:59 +0000 (UTC) From: Ian Lepore <ian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r262244 - head/sys/arm/freescale/imx Message-ID: <201402201429.s1KETxk3090247@svn.freebsd.org>
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Author: ian Date: Thu Feb 20 14:29:59 2014 New Revision: 262244 URL: http://svnweb.freebsd.org/changeset/base/262244 Log: Add early printf support, wrapped in #if 0 because it's only rarely needed. Modified: head/sys/arm/freescale/imx/imx6_machdep.c Modified: head/sys/arm/freescale/imx/imx6_machdep.c ============================================================================== --- head/sys/arm/freescale/imx/imx6_machdep.c Thu Feb 20 13:33:18 2014 (r262243) +++ head/sys/arm/freescale/imx/imx6_machdep.c Thu Feb 20 14:29:59 2014 (r262244) @@ -190,3 +190,27 @@ u_int imx_soc_type() return (IMXSOC_6Q); } +/* + * Early putc routine for EARLY_PRINTF support. To use, add to kernel config: + * option SOCDEV_PA=0x02000000 + * option SOCDEV_VA=0x02000000 + * option EARLY_PRINTF + * Resist the temptation to change the #if 0 to #ifdef EARLY_PRINTF here. It + * makes sense now, but if multiple SOCs do that it will make early_putc another + * duplicate symbol to be eliminated on the path to a generic kernel. + */ +#if 0 +static void +imx6_early_putc(int c) +{ + volatile uint32_t * UART_STAT_REG = (uint32_t *)0x02020098; + volatile uint32_t * UART_TX_REG = (uint32_t *)0x02020040; + const uint32_t UART_TXRDY = (1 << 3); + + while ((*UART_STAT_REG & UART_TXRDY) == 0) + continue; + *UART_TX_REG = c; +} +early_putc_t *early_putc = imx6_early_putc; +#endif +
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