diff options
Diffstat (limited to 'src/arch/x86')
| -rw-r--r-- | src/arch/x86/Kconfig | 14 | ||||
| -rw-r--r-- | src/arch/x86/assembly_entry.S | 11 |
2 files changed, 25 insertions, 0 deletions
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig index 8609e20136..1fea99ac3b 100644 --- a/src/arch/x86/Kconfig +++ b/src/arch/x86/Kconfig @@ -179,3 +179,17 @@ config VERSTAGE_ADDR # from a program loaded in ram and subsequently loading ramstage. config POSTCAR_STAGE def_bool n + +config VERSTAGE_DEBUG_SPINLOOP + bool + default n + help + Add a spin (JMP .) in assembly_entry.S during early verstage to wait + for a JTAG debugger to break into the execution sequence. + +config ROMSTAGE_DEBUG_SPINLOOP + bool + default n + help + Add a spin (JMP .) in assembly_entry.S during early romstage to wait + for a JTAG debugger to break into the execution sequence. diff --git a/src/arch/x86/assembly_entry.S b/src/arch/x86/assembly_entry.S index 86dbba4668..d1f5d61ce7 100644 --- a/src/arch/x86/assembly_entry.S +++ b/src/arch/x86/assembly_entry.S @@ -52,6 +52,17 @@ _start: sub %edi, %ecx rep stosl +#if ((ENV_VERSTAGE && IS_ENABLED(CONFIG_VERSTAGE_DEBUG_SPINLOOP)) \ + || (ENV_ROMSTAGE && IS_ENABLED(CONFIG_ROMSTAGE_DEBUG_SPINLOOP))) + + /* Wait for a JTAG debugger to break in and set EBX non-zero */ + xor %ebx, %ebx + +debug_spinloop: + cmp $0, %ebx + jz debug_spinloop +#endif + jmp car_stage_entry /* This is here for linking purposes. */ |