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bdk: fiq: watchdog handling
`BDK_WATCHDOG_FIQ_ENABLE` enables watchdog handling. `BDK_RESTART_BL_ON_WDT` causes a reload of bootloader on FIQ These 2 are useful when wanting to detect and handle hangs.
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@ -97,6 +97,10 @@ _irq_setup:
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MSR CPSR, #(MODE_IRQ | IRQ | FIQ) /* IRQ mode, IRQ/FIQ disabled */
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LDR SP, =0x40040000
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/* Setup FIQ stack pointer */
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MSR CPSR, #(MODE_FIQ | IRQ | FIQ) /* FIQ mode, IRQ/FIQ disabled */
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LDR SP, =0x40040000
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/* Setup SYS stack pointer */
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MSR CPSR, #(MODE_SYS | IRQ | FIQ) /* SYSTEM mode, IRQ/FIQ disabled */
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LDR SP, =0x4003FF00 /* Will be changed later to DRAM */
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@ -111,7 +115,9 @@ _irq_setup:
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B ipl_main
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B .
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_reset:
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.globl excp_reset
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.type excp_reset, %function
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excp_reset:
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LDR R0, =EXCP_EN_ADDR
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LDR R1, =0x30505645 /* EVP0 */
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STR R1, [R0] /* EVP0 in EXCP_EN_ADDR */
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@ -129,25 +135,25 @@ _reset_handler:
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LDR R0, =EXCP_TYPE_ADDR
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LDR R1, =0x545352 /* RST */
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STR R1, [R0] /* RST in EXCP_TYPE_ADDR */
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B _reset
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B excp_reset
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_undefined_handler:
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LDR R0, =EXCP_TYPE_ADDR
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LDR R1, =0x464455 /* UDF */
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STR R1, [R0] /* UDF in EXCP_TYPE_ADDR */
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B _reset
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B excp_reset
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_prefetch_abort_handler:
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LDR R0, =EXCP_TYPE_ADDR
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LDR R1, =0x54424150 /* PABT */
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STR R1, [R0] /* PABT in EXCP_TYPE_ADDR */
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B _reset
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B excp_reset
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_data_abort_handler:
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LDR R0, =EXCP_TYPE_ADDR
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LDR R1, =0x54424144 /* DABT */
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STR R1, [R0] /* DABT in EXCP_TYPE_ADDR */
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B _reset
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B excp_reset
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.globl irq_enable_cpu_irq_exceptions
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.type irq_enable_cpu_irq_exceptions, %function
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@ -27,6 +27,7 @@
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//#define DPRINTF(...) gfx_printf(__VA_ARGS__)
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#define DPRINTF(...)
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extern void excp_reset();
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extern void irq_disable();
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extern void irq_enable_cpu_irq_exceptions();
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extern void irq_disable_cpu_irq_exceptions();
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@ -271,4 +272,14 @@ void __attribute__ ((target("arm"), interrupt ("FIQ"))) fiq_handler()
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len--;
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}
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*/
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#ifdef BDK_WATCHDOG_FIQ_ENABLE
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// Set watchdog timeout status and disable WDT and its FIQ signal.
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watchdog_handle();
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#ifdef BDK_RESTART_BL_ON_WDT
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// Restart bootloader.
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excp_reset();
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#endif
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#endif
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}
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