Merge pull request #4392 from tannewt/lower_default_flash_speed

Lower default flash speed.

Author: jepler

ports/raspberrypi/Makefile

@@ -234,7 +234,7 @@ SRC_COMMON_HAL_SHARED_MODULE_EXPANDED = $(sort $(SRC_COMMON_HAL_EXPANDED) $(SRC_
 
 SRC_S = supervisor/$(CHIP_FAMILY)_cpu.s
 BOOT2_S_UPPER ?= sdk/src/rp2_common/boot_stage2/boot2_generic_03h.S
-BOOT2_S_CFLAGS ?= -DPICO_FLASH_SPI_CLKDIV=2
+BOOT2_S_CFLAGS ?= -DPICO_FLASH_SPI_CLKDIV=6
 SRC_S_UPPER = sdk/src/rp2_common/hardware_divider/divider.S \
               sdk/src/rp2_common/hardware_irq/irq_handler_chain.S \
               sdk/src/rp2_common/pico_bit_ops/bit_ops_aeabi.S \