esp32s3/elf: Fix ELF loader on ESP32-S3 when using external PSRAM

Prior to this commit, it wasn't possible to load ELF modules from
the external PSRAM. There were two main issues about it: 1) copying
data using the instruction bus was being used instead of the data
bus (this, per si, isn't a problem, but requires special attention
regarding data alignment), and 2) the cache was not being properly
cleaned and flushed to properly access the loaded data using the
instruction bus.

Signed-off-by: Tiago Medicci Serrano <[email protected]>

Author: tmedicci

arch/xtensa/Kconfig

@@ -89,6 +89,8 @@ config ARCH_CHIP_ESP32S3
 	select ARCH_HAVE_TEXT_HEAP_SEPARATE_DATA_ADDRESS
 	select ARCH_HAVE_TEXT_HEAP_WORD_ALIGNED_READ
 	select ARCH_HAVE_TESTSET
+	select ARCH_DCACHE
+	select ARCH_ICACHE
 	select ARCH_VECNOTIRQ
 	select LIBC_PREVENT_STRING_KERNEL
 	select LIBC_ARCH_MEMCPY if BUILD_FLAT

arch/xtensa/src/esp32s3/Make.defs

@@ -28,7 +28,7 @@ HEAD_CSRC  = esp32s3_start.c
 
 # Required ESP32-S3 files (arch/xtensa/src/esp32s3)
 
-CHIP_CSRCS  = esp32s3_irq.c esp32s3_clockconfig.c esp32s3_region.c
+CHIP_CSRCS  = esp32s3_cache.c esp32s3_irq.c esp32s3_clockconfig.c esp32s3_region.c
 CHIP_CSRCS += esp32s3_systemreset.c esp32s3_user.c esp32s3_allocateheap.c esp32s3_reset_reasons.c
 CHIP_CSRCS += esp32s3_wdt.c esp32s3_gpio.c esp32s3_lowputc.c esp32s3_serial.c
 CHIP_CSRCS += esp32s3_rtc_gpio.c esp32s3_libc_stubs.c esp32s3_spi_timing.c