diff options
Diffstat (limited to 'cpu/blackfin/start.S')
| -rw-r--r-- | cpu/blackfin/start.S | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/cpu/blackfin/start.S b/cpu/blackfin/start.S index 8303292..9975a0c 100644 --- a/cpu/blackfin/start.S +++ b/cpu/blackfin/start.S @@ -1,7 +1,7 @@ /* * U-boot - start.S Startup file for Blackfin u-boot * - * Copyright (c) 2005-2007 Analog Devices Inc. + * Copyright (c) 2005-2008 Analog Devices Inc. * * This file is based on head.S * Copyright (c) 2003 Metrowerks/Motorola @@ -49,8 +49,8 @@ ENTRY(_start) /* Set our initial stack to L1 scratch space */ - sp.l = LO(L1_SRAM_SCRATCH + L1_SRAM_SCRATCH_SIZE); - sp.h = HI(L1_SRAM_SCRATCH + L1_SRAM_SCRATCH_SIZE); + sp.l = LO(L1_SRAM_SCRATCH_END - 20); + sp.h = HI(L1_SRAM_SCRATCH_END - 20); #ifdef CONFIG_HW_WATCHDOG # ifndef CONFIG_HW_WATCHDOG_TIMEOUT_START @@ -75,7 +75,7 @@ ENTRY(_start) serial_early_puts("Init Registers"); - /* Disable nested interrupts and enable CYCLES for udelay() */ + /* Disable self-nested interrupts and enable CYCLES for udelay() */ R0 = CCEN | 0x30; SYSCFG = R0; @@ -180,7 +180,7 @@ ENTRY(_start) /* Now lower ourselves from the highest interrupt level to * the lowest. We do this by masking all interrupts but 15, - * setting the 15 handler to "board_init_f", raising the 15 + * setting the 15 handler to ".Lenable_nested", raising the 15 * interrupt, and then returning from the highest interrupt * level to the dummy "jump" until the interrupt controller * services the pending 15 interrupt. @@ -190,20 +190,23 @@ ENTRY(_start) r1 = r6; p0.l = LO(EVT15); p0.h = HI(EVT15); - p1.l = _cpu_init_f; - p1.h = _cpu_init_f; + p1.l = .Lenable_nested; + p1.h = .Lenable_nested; [p0] = p1; - p2.l = LO(IMASK); - p2.h = HI(IMASK); - p3.l = LO(EVT_IVG15); - p3.h = HI(EVT_IVG15); - [p2] = p3; + r7 = EVT_IVG15 (z); + sti r7; raise 15; p4.l = .LWAIT_HERE; p4.h = .LWAIT_HERE; reti = p4; rti; + /* Enable nested interrupts before continuing with cpu init */ +.Lenable_nested: + cli r7; + [--sp] = reti; + jump.l _cpu_init_f; + .LWAIT_HERE: jump .LWAIT_HERE; ENDPROC(_start) |