Add NXP i.MX 8M Mini (imx8mm) target

.github/workflows/test-configs.yml

@@ -834,6 +834,30 @@ jobs:
       config-file: ./config/examples/imx8qm-mek.config
       make-args: DISK_SDCARD=1 IMX8QM_SCU=0 wolfboot.bin test-app/image_v1_signed.bin
 
+  imx8mm_test:
+    uses: ./.github/workflows/test-build-aarch64.yml
+    with:
+      arch: aarch64
+      # BL33: MMU, eMMC (8-bit HS), signed FIT on FAT32
+      config-file: ./config/examples/imx8mm-pico.config
+      make-args: wolfboot.bin test-app/image_v1_signed.bin
+
+  imx8mm_ramboot_test:
+    uses: ./.github/workflows/test-build-aarch64.yml
+    with:
+      arch: aarch64
+      # RAM-boot: loaded and started by U-Boot proper ("go")
+      config-file: ./config/examples/imx8mm-pico.config
+      make-args: IMX8MM_BL33=0 wolfboot.bin test-app/image_v1_signed.bin
+
+  imx8mm_bl33_ram_test:
+    uses: ./.github/workflows/test-build-aarch64.yml
+    with:
+      arch: aarch64
+      # BL33: kernel placed in DRAM by SPL, MMU off
+      config-file: ./config/examples/imx8mm-pico.config
+      make-args: IMX8MM_BL33=1 DISK_EMMC=0 IMX8MM_MMU=0 wolfboot.bin test-app/image_v1_signed.bin
+
   disk_boot_confirm_test:
     uses: ./.github/workflows/test-build-aarch64.yml
     with:

.gitignore

@@ -581,6 +581,11 @@ tools/scripts/cm4/*.bin
 tools/scripts/cm4/linux/
 tools/scripts/cm4/rauc/
 
+# tools/scripts/imx8mm outputs
+/imx8mm_flashbin/
+/imx8mm_fit/
+/fitImage_*.itb
+
 # TI cl2000 (ARCH=C2000) intermediate assembly listings left in the repo root
 /*.asm
 

Makefile

@@ -489,6 +489,11 @@ ifeq ($(TARGET),imx8qm)
     MAIN_TARGET:=wolfboot.bin test-app/image_v1_signed.bin
 endif
 
+# i.MX 8M Mini runs from DRAM; tools/scripts/imx8mm builds the boot images.
+ifeq ($(TARGET),imx8mm)
+    MAIN_TARGET:=wolfboot.bin test-app/image_v1_signed.bin
+endif
+
 # i.MX95 M7 runs from ITCM (loaded by the Linux remoteproc driver); the payload
 # lives in DDR at 0x80100000, so there is no contiguous flash image to assemble.
 ifeq ($(TARGET),imx95_m7)

arch.mk

@@ -324,6 +324,8 @@ ifeq ($(ARCH),AARCH64)
     # uSDHC board facts. Here rather than in the config because a command-line
     # CFLAGS_EXTRA= would replace the config's, whereas CFLAGS is additive.
     ifneq ($(filter 1,$(DISK_SDCARD) $(DISK_EMMC)),)
+      # uSDHC -> SDHCI shim, shared with imx8mm
+      OBJS+=hal/imx_usdhc_sdhci.o
       # Card detect is lsio_gpio5[22], so PRES_STATE bit 16 never sets.
       # SDMA is on: the read is the dominant boot cost and PIO caps it near
       # 1.6 MB/s regardless of bus clock. IMX8QM_SDHCI_PIO=1 falls back.
@@ -357,6 +359,13 @@ ifeq ($(ARCH),AARCH64)
     endif
   endif
 
+  ifeq ($(TARGET),imx8mm)
+    # uSDHC -> SDHCI shim, shared with imx8qm
+    ifneq ($(filter 1,$(DISK_SDCARD) $(DISK_EMMC)),)
+      OBJS+=hal/imx_usdhc_sdhci.o
+    endif
+  endif
+
   ifeq ($(TARGET),imx95_a55)
     # NXP i.MX95 Cortex-A55 cluster, running as BL33 in AHAB container 2.
     # -mstrict-align because this stage runs with the MMU off, so every access

config/examples/imx8mm-pico.config

@@ -0,0 +1,76 @@
+# TechNexion PICO-IMX8MM (i.MX 8M Mini). See docs/Targets.md.
+ARCH?=AARCH64
+TARGET?=imx8mm
+SIGN?=RSA4096
+HASH?=SHA3
+DEBUG?=1
+VTOR?=1
+SPMATH?=1
+IMAGE_HEADER_SIZE?=1024
+PKA?=1
+WOLFTPM?=0
+# Console on UART2. DEBUG_UART=0 also needs -DWOLFBOOT_NO_PRINTF.
+DEBUG_UART?=1
+# Linux-targeted toolchains: no glibc FORTIFY calls, no PIE
+CFLAGS_EXTRA+=-U_FORTIFY_SOURCE -fno-pie
+LDFLAGS_EXTRA+=-no-pie
+NO_XIP?=1
+NO_QNX?=1
+WOLFBOOT_SECTOR_SIZE=0x400
+WOLFBOOT_NO_PARTITIONS=1
+# IMX8MM_BL33=1: started by ATF as BL33, in place of U-Boot proper
+# IMX8MM_BL33=0: RAM-boot, loaded to DRAM and started by U-Boot ("go 0x40480000")
+IMX8MM_BL33?=1
+ifeq ($(IMX8MM_BL33),1)
+  # BL33 address (U-Boot CONFIG_TEXT_BASE)
+  WOLFBOOT_LOAD_BASE?=0x40200000
+  # DISK_EMMC=0: signed kernel placed by SPL
+  IMX8MM_KERNEL_ADDR?=0x48000000
+  # 64 MB: up to 0x48000000 from the kernel run address
+  WOLFBOOT_RAMBOOT_MAX_SIZE?=0x4000000
+  CFLAGS_EXTRA+=-DIMX8MM_BL33
+  # Entered with the MMU off
+  CFLAGS_EXTRA+=-mstrict-align
+  # Identity MMU + D-cache while loading and verifying
+  IMX8MM_MMU?=1
+  ifeq ($(IMX8MM_MMU),1)
+    CFLAGS_EXTRA+=-DIMX8MM_MMU
+  endif
+  # Signed FIT read from eMMC (uSDHC3) p1, FAT32
+  DISK_EMMC?=1
+  ifeq ($(DISK_EMMC),1)
+    CFLAGS_EXTRA+=-DSDHCI_FORCE_CARD_DETECT
+    # Print the eMMC bus and partitions at boot
+    CFLAGS_EXTRA+=-DIMX8MM_EMMC_PROBE
+    # 8-bit, High Speed (50 MHz)
+    IMX8MM_EMMC_HS?=1
+    ifeq ($(IMX8MM_EMMC_HS),1)
+      CFLAGS_EXTRA+=-DSDHCI_EMMC_BUS_WIDTH=8 -DSDHCI_EMMC_HS
+    endif
+    DISK_FS?=fat32
+    CFLAGS_EXTRA+=-DBOOT_PART_A=0 -DBOOT_PART_B=0
+    CFLAGS_EXTRA+=-DBOOT_FILE_A='"/fitImage_A.itb"'
+    CFLAGS_EXTRA+=-DBOOT_FILE_B='"/fitImage_B.itb"'
+    # Whole FIT is read and verified here
+    WOLFBOOT_LOAD_ADDRESS?=0x48000000
+    # 64 KB SDMA reads
+    DISK_BLOCK_SIZE?=65536
+    CFLAGS_EXTRA+=-DDISK_BLOCK_SIZE=$(DISK_BLOCK_SIZE)
+    # Keep WOLFBOOT_FS_CACHE_SIZE at 512: larger is read by SDMA into an
+    # unaligned buffer
+  endif
+else
+  # RAM-boot load and entry address
+  WOLFBOOT_LOAD_BASE?=0x40480000
+  # Signed kernel at +0xC0000 in wolfboot_linux.bin
+  IMX8MM_KERNEL_ADDR?=0x40540000
+  # 42 MB: the kernel must end below the DTB at 0x43000000
+  WOLFBOOT_RAMBOOT_MAX_SIZE?=0x2A00000
+endif
+CFLAGS_EXTRA+=-DIMX8MM_KERNEL_ADDR=$(IMX8MM_KERNEL_ADDR)
+# Kernel run address
+WOLFBOOT_LOAD_ADDRESS?=0x44000000
+# DTB address
+WOLFBOOT_LOAD_DTS_ADDRESS?=0x43000000
+# Image read from DRAM (memcpy), RAM boot
+EXT_FLASH?=1