This adds a compile time option to include code for static exception vectors. Static exception vectors are only needed, when the U-Boot entry point is equal to the CPU reset exception vector address. For instance this is the case when U-Boot is used as ROM in Qemu or booted from parallel NOR flash. When U-Boot is booted from RAM (e.g. loaded there by SPL), the exception vectors need to be setup dynamically, which is done in follow-up commits.
Signed-off-by: Daniel Schwierzeck daniel.schwierzeck@gmail.com ---
arch/mips/Kconfig | 21 +++++++++++++++++++++ arch/mips/cpu/start.S | 11 ++++++++--- arch/mips/mach-ath79/Kconfig | 2 ++ arch/mips/mach-pic32/Kconfig | 1 + 4 files changed, 32 insertions(+), 3 deletions(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 097ad58..709ac5c 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -20,6 +20,7 @@ config TARGET_QEMU_MIPS select SUPPORTS_CPU_MIPS32_R2 select SUPPORTS_CPU_MIPS64_R1 select SUPPORTS_CPU_MIPS64_R2 + select ROM_EXCEPTION_VECTORS
config TARGET_MALTA bool "Support malta" @@ -40,6 +41,7 @@ config TARGET_MALTA select SUPPORTS_CPU_MIPS64_R6 select SWAP_IO_SPACE select MIPS_L1_CACHE_SHIFT_6 + select ROM_EXCEPTION_VECTORS
config TARGET_VCT bool "Support vct" @@ -47,6 +49,7 @@ config TARGET_VCT select SUPPORTS_CPU_MIPS32_R1 select SUPPORTS_CPU_MIPS32_R2 select SYS_MIPS_CACHE_INIT_RAM_LOAD + select ROM_EXCEPTION_VECTORS
config TARGET_DBAU1X00 bool "Support dbau1x00" @@ -55,6 +58,7 @@ config TARGET_DBAU1X00 select SUPPORTS_CPU_MIPS32_R1 select SUPPORTS_CPU_MIPS32_R2 select SYS_MIPS_CACHE_INIT_RAM_LOAD + select ROM_EXCEPTION_VECTORS select MIPS_TUNE_4KC
config TARGET_PB1X00 @@ -63,6 +67,7 @@ config TARGET_PB1X00 select SUPPORTS_CPU_MIPS32_R1 select SUPPORTS_CPU_MIPS32_R2 select SYS_MIPS_CACHE_INIT_RAM_LOAD + select ROM_EXCEPTION_VECTORS select MIPS_TUNE_4KC
config ARCH_ATH79 @@ -91,6 +96,7 @@ config TARGET_BOSTON select SUPPORTS_CPU_MIPS64_R1 select SUPPORTS_CPU_MIPS64_R2 select SUPPORTS_CPU_MIPS64_R6 + select ROM_EXCEPTION_VECTORS
config TARGET_XILFPGA bool "Support Imagination Xilfpga" @@ -103,6 +109,7 @@ config TARGET_XILFPGA select SUPPORTS_CPU_MIPS32_R1 select SUPPORTS_CPU_MIPS32_R2 select MIPS_L1_CACHE_SHIFT_4 + select ROM_EXCEPTION_VECTORS help This supports IMGTEC MIPSfpga platform
@@ -192,6 +199,20 @@ config CPU_MIPS64_R6
endchoice
+menu "General setup" + +config ROM_EXCEPTION_VECTORS + bool "Build U-Boot image with exception vectors" + help + Enable this to include exception vectors in the U-Boot image. This is + required if the U-Boot entry point is equal to the address of the + CPU reset exception vector (e.g. U-Boot as ROM loader in Qemu, + U-Boot booted from parallel NOR flash). + Disable this, if the U-Boot image is booted from DRAM (e.g. by SPL). + In that case the image size will be reduced by 0x500 bytes. + +endmenu + menu "OS boot interface"
config MIPS_BOOT_CMDLINE_LEGACY diff --git a/arch/mips/cpu/start.S b/arch/mips/cpu/start.S index 3f0fc12..108d2df 100644 --- a/arch/mips/cpu/start.S +++ b/arch/mips/cpu/start.S @@ -57,7 +57,6 @@ ENTRY(_start) b reset nop
- .org 0x10 #if defined(CONFIG_SYS_XWAY_EBU_BOOTCFG) /* * Almost all Lantiq XWAY SoC devices have an external bus unit (EBU) to @@ -66,16 +65,20 @@ ENTRY(_start) * initial configuration for that EBU in order to access the flash * device with correct parameters. This config option is board-specific. */ + .org 0x10 .word CONFIG_SYS_XWAY_EBU_BOOTCFG .word 0x0 -#elif defined(CONFIG_MALTA) +#endif +#if defined(CONFIG_MALTA) /* * Linux expects the Board ID here. */ + .org 0x10 .word 0x00000420 # 0x420 (Malta Board with CoreLV) .word 0x00000000 #endif
+#if defined(CONFIG_ROM_EXCEPTION_VECTORS) .org 0x200 /* TLB refill, 32 bit task */ 1: b 1b @@ -106,7 +109,9 @@ ENTRY(_start) 1: b 1b nop
- .align 4 + .org 0x500 +#endif + reset: #if __mips_isa_rev >= 6 mfc0 t0, CP0_CONFIG, 5 diff --git a/arch/mips/mach-ath79/Kconfig b/arch/mips/mach-ath79/Kconfig index 7d483aa..d982b0f 100644 --- a/arch/mips/mach-ath79/Kconfig +++ b/arch/mips/mach-ath79/Kconfig @@ -9,6 +9,7 @@ config SOC_AR933X select SUPPORTS_BIG_ENDIAN select SUPPORTS_CPU_MIPS32_R1 select SUPPORTS_CPU_MIPS32_R2 + select ROM_EXCEPTION_VECTORS select MIPS_TUNE_24KC help This supports QCA/Atheros ar933x family SOCs. @@ -27,6 +28,7 @@ config SOC_QCA953X select SUPPORTS_BIG_ENDIAN select SUPPORTS_CPU_MIPS32_R1 select SUPPORTS_CPU_MIPS32_R2 + select ROM_EXCEPTION_VECTORS select MIPS_TUNE_24KC help This supports QCA/Atheros qca953x family SOCs. diff --git a/arch/mips/mach-pic32/Kconfig b/arch/mips/mach-pic32/Kconfig index 2e38bb7..8fad4cf 100644 --- a/arch/mips/mach-pic32/Kconfig +++ b/arch/mips/mach-pic32/Kconfig @@ -14,6 +14,7 @@ config SOC_PIC32MZDA select SUPPORTS_CPU_MIPS32_R2 select MIPS_L1_CACHE_SHIFT_4 select SYS_MIPS_CACHE_INIT_RAM_LOAD + select ROM_EXCEPTION_VECTORS help This supports Microchip PIC32MZ[DA] family of microcontrollers.