This patch adds the code to copy itself from bootrom location to a different location (TEXT_BASE) to the Octeon platform. Its used in this case to copy the complete U-Boot image into L2 cache, which greatly improves the bootup time - especially in regard to the very long and complex DDR4 init code.
The Kconfig symbol CONFIG_MIPS_MACH_EARLY_INIT is enabled with this patch for Octeon. Signed-off-by: Stefan Roese <[email protected]> --- arch/mips/Kconfig | 1 + arch/mips/mach-octeon/lowlevel_init.S | 56 +++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index 327fd4848a..bcf6f26457 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -114,6 +114,7 @@ config ARCH_OCTEON select DM select DM_SERIAL select MIPS_L2_CACHE + select MIPS_MACH_EARLY_INIT select MIPS_TUNE_OCTEON3 select ROM_EXCEPTION_VECTORS select SUPPORTS_BIG_ENDIAN diff --git a/arch/mips/mach-octeon/lowlevel_init.S b/arch/mips/mach-octeon/lowlevel_init.S index d9aab38cde..2d9257b1ed 100644 --- a/arch/mips/mach-octeon/lowlevel_init.S +++ b/arch/mips/mach-octeon/lowlevel_init.S @@ -17,3 +17,59 @@ LEAF(lowlevel_init) jr ra nop END(lowlevel_init) + +LEAF(mips_mach_early_init) + + move s0, ra + + bal __dummy + nop + +__dummy: + /* Get the actual address that we are running at */ + PTR_LA a6, _start /* Linked address of _start */ + PTR_LA a7, __dummy + dsubu t1, a7, a6 /* offset of __dummy label from _start*/ + dsubu t0, ra, t1 /* t0 now has actual address of _start*/ + + PTR_LI t1, CONFIG_SYS_TEXT_BASE + + /* Calculate end address of copy loop */ + PTR_LI s5, CONFIG_BOARD_SIZE_LIMIT + daddu t2, s5, t0 /* t2 = end address */ + daddiu t2, t2, 127 + ins t2, zero, 0, 7 /* Round up to cache line for memcpy */ + + /* Copy ourself to the L2 cache from flash, 32 bytes at a time */ +1: + ld a0, 0(t0) + ld a1, 8(t0) + ld a2, 16(t0) + ld a3, 24(t0) + sd a0, 0(t1) + sd a1, 8(t1) + sd a2, 16(t1) + sd a3, 24(t1) + addiu t0, 32 + bne t0, t2, 1b + addiu t1, 32 + + sync + synci 0(zero) + + PTR_LA t9, uboot_in_cache + j t9 + nop + +uboot_in_cache: + + /* + * Return to start.S now running from TEXT_BASE, which points + * to DRAM address space, which effectively is L2 cache now. + * This speeds up the init process extremely, especially the + * DDR init code. + */ + jr s0 + nop + + END(mips_mach_early_init) -- 2.27.0
