u-boot/arch/blackfin/lib/boot.c
Michael Hennerich 5fc564eda7 Blackfin: shutdown video DMA when booting Linux
In case there is no frame buffer driver present in Linux to hand over the
PPI LCD DMA upon boot, the DMA initiated by u-boot to display the splash
screen runs unattended.  Therefore always stop the video driver in u-boot
before starting Linux.  If people don't want this behavior, then they can
simply stub out the video_stop() function in their board video driver.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-08-11 11:29:08 -04:00

72 lines
1.4 KiB
C

/*
* U-boot - boot.c - misc boot helper functions
*
* Copyright (c) 2005-2008 Analog Devices Inc.
*
* (C) Copyright 2000-2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <command.h>
#include <image.h>
#include <asm/blackfin.h>
#ifdef SHARED_RESOURCES
extern void swap_to(int device_id);
#endif
#ifdef CONFIG_VIDEO
extern void video_stop(void);
#endif
static char *make_command_line(void)
{
char *dest = (char *)CONFIG_LINUX_CMDLINE_ADDR;
char *bootargs = getenv("bootargs");
if (bootargs == NULL)
return NULL;
strncpy(dest, bootargs, CONFIG_LINUX_CMDLINE_SIZE);
dest[CONFIG_LINUX_CMDLINE_SIZE - 1] = 0;
return dest;
}
extern ulong bfin_poweron_retx;
int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
{
int (*appl) (char *cmdline);
char *cmdline;
if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
return 1;
#ifdef SHARED_RESOURCES
swap_to(FLASH);
#endif
#ifdef CONFIG_VIDEO
/* maybe this should be standardized and moved to bootm ... */
video_stop();
#endif
appl = (int (*)(char *))images->ep;
printf("Starting Kernel at = %p\n", appl);
cmdline = make_command_line();
icache_disable();
dcache_disable();
asm __volatile__(
"RETX = %[retx];"
"CALL (%0);"
:
: "p"(appl), "q0"(cmdline), [retx] "d"(bfin_poweron_retx)
);
/* does not return */
return 1;
}