Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 337d390b authored by Robin Getz's avatar Robin Getz Committed by Bryan Wu
Browse files

Blackfin arch: Print out debug info, as early as possible 



Print out debug info, as early as possible - even before the
kernel initializes the interrupt vectors. Now we can print out debug
messages almost anytime during the boot process.

Signed-off-by: default avatarRobin Getz <robin.getz@analog.com>
Signed-off-by: default avatarBryan Wu <bryan.wu@analog.com>
parent ce3afa1c

arch/blackfin/kernel/early_printk.c

+57 −4
Original line number Diff line number Diff line
@@ -38,13 +38,13 @@ extern struct console *bfin_earlyserial_init(unsigned int port, 


static struct console *early_console;



/* Default console

 * Port n == ttyBFn

 * cflags == UART output modes

 */

/* Default console */

#define DEFAULT_PORT 0

#define DEFAULT_CFLAG CS8|B57600



/* Default console for early crashes */

#define DEFAULT_EARLY_PORT "serial,uart0,57600"



#ifdef CONFIG_SERIAL_CORE

/* What should get here is "0,57600" */

static struct console * __init earlyserial_init(char *buf)
@@ -158,4 +158,57 @@ int __init setup_early_printk(char *buf) 
	return 0;

}



/*

 * Set up a temporary Event Vector Table, so if something bad happens before

 * the kernel is fully started, it doesn't vector off into somewhere we don't

 * know

 */



asmlinkage void __init init_early_exception_vectors(void)

{

	SSYNC();



	/* cannot program in software:

	 * evt0 - emulation (jtag)

	 * evt1 - reset

	 */

	bfin_write_EVT2(early_trap);

	bfin_write_EVT3(early_trap);

	bfin_write_EVT5(early_trap);

	bfin_write_EVT6(early_trap);

	bfin_write_EVT7(early_trap);

	bfin_write_EVT8(early_trap);

	bfin_write_EVT9(early_trap);

	bfin_write_EVT10(early_trap);

	bfin_write_EVT11(early_trap);

	bfin_write_EVT12(early_trap);

	bfin_write_EVT13(early_trap);

	bfin_write_EVT14(early_trap);

	bfin_write_EVT15(early_trap);

	CSYNC();



	/* Set all the return from interupt, exception, NMI to a known place

	 * so if we do a RETI, RETX or RETN by mistake - we go somewhere known

	 * Note - don't change RETS - we are in a subroutine, or

	 * RETE - since it might screw up if emulator is attached

	 */

	asm("\tRETI = %0; RETX = %0; RETN = %0;\n"

		: : "p"(early_trap));



}



asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr)

{

	/* This can happen before the uart is initialized, so initialize

	 * the UART now

	 */

	if (likely(early_console == NULL))

		setup_early_printk(DEFAULT_EARLY_PORT);



	dump_bfin_regs(fp, retaddr);

	dump_bfin_trace_buffer();



	panic("Died early");

}



early_param("earlyprintk", setup_early_printk);

arch/blackfin/mach-bf533/head.S

+6 −0
Original line number Diff line number Diff line
@@ -181,6 +181,12 @@ ENTRY(__start) 
	fp = sp;

	usp = sp;



#ifdef CONFIG_EARLY_PRINTK

	SP += -12;

	call _init_early_exception_vectors;

	SP += 12;

#endif



	/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */

	call _bf53x_relocate_l1_mem;

#if CONFIG_BFIN_KERNEL_CLOCK

arch/blackfin/mach-bf537/head.S

+6 −0
Original line number Diff line number Diff line
@@ -224,6 +224,12 @@ ENTRY(__start) 
	fp = sp;

	usp = sp;



#ifdef CONFIG_EARLY_PRINTK

	SP += -12;

	call _init_early_exception_vectors;

	SP += 12;

#endif



	/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */

	call _bf53x_relocate_l1_mem;

#if CONFIG_BFIN_KERNEL_CLOCK

arch/blackfin/mach-bf548/head.S

+6 −0
Original line number Diff line number Diff line
@@ -125,6 +125,12 @@ ENTRY(__stext) 
	FP = SP;

	USP = SP;



#ifdef CONFIG_EARLY_PRINTK

	SP += -12;

	call _init_early_exception_vectors;

	SP += 12;

#endif



	/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */

	call _bf53x_relocate_l1_mem;

#if CONFIG_BFIN_KERNEL_CLOCK

arch/blackfin/mach-bf561/head.S

+6 −0
Original line number Diff line number Diff line
@@ -169,6 +169,12 @@ ENTRY(__start) 
	fp = sp;

	usp = sp;



#ifdef CONFIG_EARLY_PRINTK

	SP += -12;

	call _init_early_exception_vectors;

	SP += 12;

#endif



	/* Put The Code for PLL Programming and SDRAM Programming in L1 ISRAM */

	call _bf53x_relocate_l1_mem;

#if CONFIG_BFIN_KERNEL_CLOCK