mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-05 10:46:15 +09:00
5fc564eda7
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>
73 lines
1.4 KiB
C
73 lines
1.4 KiB
C
/*
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* U-boot - boot.c - misc boot helper functions
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*
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* Copyright (c) 2005-2008 Analog Devices Inc.
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*
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* (C) Copyright 2000-2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <command.h>
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#include <image.h>
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#include <asm/blackfin.h>
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#ifdef SHARED_RESOURCES
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extern void swap_to(int device_id);
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#endif
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#ifdef CONFIG_VIDEO
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extern void video_stop(void);
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#endif
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static char *make_command_line(void)
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{
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char *dest = (char *)CONFIG_LINUX_CMDLINE_ADDR;
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char *bootargs = getenv("bootargs");
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if (bootargs == NULL)
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return NULL;
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strncpy(dest, bootargs, CONFIG_LINUX_CMDLINE_SIZE);
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dest[CONFIG_LINUX_CMDLINE_SIZE - 1] = 0;
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return dest;
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}
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extern ulong bfin_poweron_retx;
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int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t *images)
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{
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int (*appl) (char *cmdline);
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char *cmdline;
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if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
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return 1;
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#ifdef SHARED_RESOURCES
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swap_to(FLASH);
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#endif
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#ifdef CONFIG_VIDEO
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/* maybe this should be standardized and moved to bootm ... */
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video_stop();
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#endif
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appl = (int (*)(char *))images->ep;
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printf("Starting Kernel at = %p\n", appl);
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cmdline = make_command_line();
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icache_disable();
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dcache_disable();
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asm __volatile__(
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"RETX = %[retx];"
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"CALL (%0);"
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:
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: "p"(appl), "q0"(cmdline), [retx] "d"(bfin_poweron_retx)
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);
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/* does not return */
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return 1;
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}
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