[openwrt/openwrt] mediatek: rework Bananapi BPi-R2
LEDE Commits
lede-commits at lists.infradead.org
Mon Jul 19 20:20:10 PDT 2021
dangole pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/86a61e716efe2e0ef2f4ce9b2fdd7a532661ef56
commit 86a61e716efe2e0ef2f4ce9b2fdd7a532661ef56
Author: Daniel Golle <daniel at makrotopia.org>
AuthorDate: Sat Jul 10 16:35:47 2021 +0100
mediatek: rework Bananapi BPi-R2
* introduce recovery (=initramfs) vs. production dual boot scheme
* make use of uImage.FIT (instead of FAT partition)
* generate images using build steps (instead of external scripts)
* simplify sysupgrade and config restore (thanks to uImage.FIT)
* make sure mmc devices are ordered persistently (set DT aliases)
This commit breaks sysupgrade from existing installations, you will
have to re-install using the sdcard.img.gz image.
Signed-off-by: Daniel Golle <daniel at makrotopia.org>
---
target/linux/mediatek/image/Config.in | 2 +-
target/linux/mediatek/image/mt7623.mk | 144 +++++++++++++++------
target/linux/mediatek/image/mt7623n_bpir2-uEnv.txt | 78 -----------
.../mt7623/base-files/lib/preinit/79_move_config | 3 -
.../mt7623/base-files/lib/upgrade/platform.sh | 50 +++----
target/linux/mediatek/mt7623/config-5.10 | 1 +
.../160-dts-mt7623-bpi-r2-earlycon.patch | 11 ++
.../161-dts-mt7623-bpi-r2-mmc-device-order.patch | 11 ++
8 files changed, 153 insertions(+), 147 deletions(-)
diff --git a/target/linux/mediatek/image/Config.in b/target/linux/mediatek/image/Config.in
index ef8536ebab..63329d386a 100644
--- a/target/linux/mediatek/image/Config.in
+++ b/target/linux/mediatek/image/Config.in
@@ -1,4 +1,4 @@
config MTK_BOOT_PARTSIZE
int "Boot (SD Card/eMMC) filesystem partition size (in MiB)"
- depends on TARGET_mediatek_mt7623_DEVICE_bpi_bananapi-r2 || TARGET_DEVICE_mediatek_mt7623_DEVICE_bpi_bananapi-r2 || TARGET_mediatek_mt7623_DEVICE_unielec_u7623-emmc || TARGET_DEVICE_mediatek_mt7623_DEVICE_unielec_u7623-emmc
+ depends on TARGET_mediatek_mt7623_DEVICE_unielec_u7623-emmc || TARGET_DEVICE_mediatek_mt7623_DEVICE_unielec_u7623-emmc
default 32
diff --git a/target/linux/mediatek/image/mt7623.mk b/target/linux/mediatek/image/mt7623.mk
index 56f67c0e89..c404b333ba 100644
--- a/target/linux/mediatek/image/mt7623.mk
+++ b/target/linux/mediatek/image/mt7623.mk
@@ -1,59 +1,123 @@
KERNEL_LOADADDR := 0x80008000
DEVICE_VARS += UBOOT_TARGET UBOOT_OFFSET UBOOT_ENVSIZE
-ifneq ($(CONFIG_MTK_BOOT_PARTSIZE),)
-BOOTFS_BLOCK_SIZE := 1024
-BOOTFS_BLOCKS := $(shell echo $$(($(CONFIG_MTK_BOOT_PARTSIZE)*1024*1024/$(BOOTFS_BLOCK_SIZE))))
-endif
+# The bootrom of MT7623 expects legacy MediaTek headers present in
+# exactly the location also used for the primary GPT partition table.
+# (*MMC_BOOT and BRLYT)
+# Hence only MSDOS/MBR partitioning can work here.
+#
+# ------------------------ Sector Offset
+# | MBR + SDMMC_BOOT | 0 0x0
+# |----------------------|
+# | BRLYT header | 1 0x200
+# |----------------------|
+# . .
+# . .
+# |----------------------|
+# | | 4 0x800
+# | |
+# | Preloader |
+# . .
+# . .
+# | | 639
+# |----------------------|
+# | MBR partition #1 | 640 0x50000
+# | |
+# | U-Boot |
+# . .
+# . .
+# | | 1663
+# |----------------------|
+# | MBR partition #2 |
+# | |
+# | Recovery |
+# . .
+# . (uImage.FIT) .
+# | |
+# |----------------------|
+# | MBR partition #3 |
+# | |
+# | Production |
+# | |
+# | (uImage.FIT, |
+# . rootfs_Data.) .
+# . .
+# | |
+# ------------------------
+#
+# For eMMC boot, everything up to and including the preloader must be
+# written to /dev/mmcblk0boot0, with the SDMMC_BOOT header changed to
+# read EMMC_BOOT\0 instead.
+#
+# The contents of the main eMMC are identical to the SD card layout,
+# with the preloader loading 512KiB of U-Boot starting at 0x50000.
-define Build/mtk-mmc-img
- rm -f $@.boot
- mkfs.fat -C $@.boot $(BOOTFS_BLOCKS)
+define Build/mt7623-mbr
+ cp $@ $@.tmp 2>/dev/null || true
+ ptgen -o $@.tmp -h 4 -s 63 -a 0 -l 1024 \
+ -t 0x41 -N uboot -p 3584k at 320k \
+ -t 0xea -N recovery -p 40M at 4M \
+ $(if $(findstring sdmmc,$1), \
+ -t 0x2e -N production -p 208M at 48M \
+ ) \
+ $(if $(findstring emmc,$1), \
+ -t 0x2e -N production -p 976M at 48M \
+ )
- if [ -r $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-preloader.bin ]; then \
- ./gen_mtk_mmc_img.sh emmc $@.emmc \
- $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-preloader.bin; \
- mcopy -i $@.boot $@.emmc ::eMMCboot.bin; \
- fi
- mkenvimage -s $(UBOOT_ENVSIZE) -o $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-uboot.env $(UBOOT_TARGET)-uEnv.txt
- mcopy -i $@.boot $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-uboot.env ::uboot.env
- mcopy -i $@.boot $(IMAGE_KERNEL) ::uImage
- ./gen_mtk_mmc_img.sh sd $@ \
- $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-preloader.bin \
- $(STAGING_DIR_IMAGE)/$(UBOOT_TARGET)-u-boot*.bin \
- $(UBOOT_OFFSET) \
- $@.boot \
- $(IMAGE_ROOTFS) \
- $(CONFIG_MTK_BOOT_PARTSIZE) \
- $(CONFIG_TARGET_ROOTFS_PARTSIZE)
+ echo -en \
+ $(if $(findstring sdmmc,$1),"SDMMC_BOOT\x00\x00\x01\x00\x00\x00\x00\x02\x00\x00") \
+ $(if $(findstring emmc,$1),"EMMC_BOOT\x00\x00\x00\x01\x00\x00\x00\x00\x02\x00\x00") \
+ | dd bs=1 of="$@.tmp" seek=0 conv=notrunc
+
+ echo -en "BRLYT\x00\x00\x00\x01\x00\x00\x00\x00\x08\x00\x00\x00\x08\x00\x00\x42\x42\x42\x42\x08\x00\x01\x00\x00\x08\x00\x00\x00\x08\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"\
+ | dd bs=1 of="$@.tmp" seek=512 conv=notrunc
+
+ cat $@.tmp >> $@
+ rm $@.tmp
endef
-define Build/preloader
- $(CP) $(STAGING_DIR_IMAGE)/$1-preloader.bin $@
+define Build/append-preloader
+ cat $(STAGING_DIR_IMAGE)/$1-preloader.bin >> $@
endef
-define Build/scatterfile
- ./gen_scatterfile.sh $(subst mt,MT,$(SUBTARGET)) "$1" \
- $(subst -scatter.txt,,$(notdir $@)) "$(DEVICE_TITLE)" > $@
+define Build/append-bootloader
+ cat $(STAGING_DIR_IMAGE)/$1-u-boot.bin >> $@
endef
-define Device/bpi_bananapi-r2
- DEVICE_VENDOR := Bpi
- DEVICE_MODEL := Banana Pi R2
+define Device/bananapi_bpi-r2
+ DEVICE_VENDOR := Bananapi
+ DEVICE_MODEL := BPi-R2
DEVICE_DTS := mt7623n-bananapi-bpi-r2
- DEVICE_PACKAGES := kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1 kmod-mmc \
- mkf2fs e2fsprogs kmod-usb-ohci kmod-usb2 kmod-usb3 kmod-ata-ahci-mtk
- UBOOT_ENVSIZE := 0x2000
+ DEVICE_PACKAGES := kmod-mmc mkf2fs e2fsprogs kmod-usb3 kmod-ata-ahci
+ UBOOT_ENVSIZE := 0x10000
UBOOT_OFFSET := 320k
UBOOT_TARGET := mt7623n_bpir2
- IMAGES := img.gz
- IMAGE/img.gz := mtk-mmc-img | gzip | append-metadata
- ARTIFACT/preloader.bin := preloader $$(UBOOT_TARGET)
- ARTIFACT/scatter.txt := scatterfile $$(firstword $$(FILESYSTEMS))-$$(firstword $$(IMAGES))
- ARTIFACTS = preloader.bin scatter.txt
+ UBOOT_PATH := $(STAGING_DIR_IMAGE)/mt7623n_bpir2-u-boot.bin
+ IMAGES := sysupgrade.itb
+ KERNEL := kernel-bin | gzip
+ KERNEL_INITRAMFS_SUFFIX := -recovery.itb
+ KERNEL_INITRAMFS := kernel-bin | gzip | fit gzip $$(DTS_DIR)/$$(DEVICE_DTS).dtb with-initrd
+ IMAGE/sysupgrade.itb := append-kernel | fit gzip $$(DTS_DIR)/$$(DEVICE_DTS).dtb external-static-with-rootfs | append-metadata
+ ARTIFACT/preloader.bin := append-preloader $$(UBOOT_TARGET)
+ ARTIFACT/u-boot.bin := append-uboot
+ ARTIFACT/sdcard.img.gz := mt7623-mbr sdmmc |\
+ pad-to 2k | append-preloader $$(UBOOT_TARGET) |\
+ pad-to 320k | append-bootloader $$(UBOOT_TARGET) |\
+ pad-to 4092k | mt7623-mbr emmc |\
+ pad-to 4M | append-image-stage initramfs-recovery.itb |\
+ pad-to 48M | append-image squashfs-sysupgrade.itb |\
+ gzip
+ ARTIFACTS = u-boot.bin preloader.bin scatter.txt sdcard.img.gz
SUPPORTED_DEVICES := bananapi,bpi-r2
endef
-TARGET_DEVICES += bpi_bananapi-r2
+TARGET_DEVICES += bananapi_bpi-r2
+
+
+
+define Build/scatterfile
+ ./gen_scatterfile.sh $(subst mt,MT,$(SUBTARGET)) "$1" \
+ $(subst -scatter.txt,,$(notdir $@)) "$(DEVICE_TITLE)" > $@
+endef
# Full eMMC image including U-Boot and partition table
define Device/unielec_u7623-emmc
diff --git a/target/linux/mediatek/image/mt7623n_bpir2-uEnv.txt b/target/linux/mediatek/image/mt7623n_bpir2-uEnv.txt
deleted file mode 100644
index f260ed9176..0000000000
--- a/target/linux/mediatek/image/mt7623n_bpir2-uEnv.txt
+++ /dev/null
@@ -1,78 +0,0 @@
-# Boot menu for Banana Pi R2
-# Copyright © 2020 David Woodhouse <dwmw2 at infradead.org>
-
-kernel=uImage
-loadaddr=0x88000000
-dtaddr=0x83f00000
-fdt_high=0xffffffff
-
-console=ttyS2,115200
-bootopts=rootfstype=squashfs,ext4 rootwait
-
-# Create the command line (with appropriate root=) and boot the Linux FIT image.
-boot1=setenv bootargs "console=${console} root=${rootdev} ${bootopts}";printenv bootargs;\
- fatload mmc ${partition} ${loadaddr} ${kernel}; bootm
-
-# The preloader leaves a breadcrumb behind to say what it booted from.
-checkbootedfrom=if itest.l *81dffff0 == 434d4d65 ; then setenv bootedfrom eMMC; else setenv bootedfrom SD; fi;
-
-# Build the boot menu one item at a time
-bm_count=0
-checkkernel=test -e mmc ${bm_part} ${kernel}
-addbm=if run checkkernel; then setenv bootmenu_${bm_count} "Boot from ${bm_dev}.=setenv partition ${bm_part};setenv rootdev ${bm_root};run boot1";if test "${bootedfrom}" = "${bm_dev}"; then setenv bootmenu_default ${bm_count};fi;setexpr bm_count ${bm_count} + 1; fi
-# Here we assume that SD card id mmcblk1 and eMMC is mmcblk0 in linux. Swap them if your DTS define them in reverse order.
-addeMMCbm=setenv bm_part 0:2;setenv bm_root /dev/mmcblk0p3;setenv bm_dev eMMC;run addbm
-addSDbm=setenv bm_part 1:2;setenv bm_root /dev/mmcblk1p3;setenv bm_dev SD;run addbm
-addinstallbm=if test "${bootedfrom}" = "SD";then run checkinstall; if run validparts; then setenv bootmenu_${bm_count} "Install OpenWrt from SD to internal eMMC.=run doinstall";setexpr bm_count ${bm_count} + 1;fi;fi
-
-runbootmenu=if test "${bootedfrom}" = "";then run checkbootedfrom;fi;\
- setenv bm_count 0;run addeMMCbm;run addSDbm;run addinstallbm;setenv bootmenu_${bm_count};\
- bootmenu
-
-bootdelay=0
-bootcmd=run checkbootedfrom;run runbootmenu
-
-# XX: Can we read this from the device, or must we trust they're all the same as mine?
-# Probably not that important as we're unlikely ever to hit the limit anyway.
-maxsect=0xe8ffff
-validparts=false
-
-# We could use 'part size' here but I'd like to check the types too.
-checkinstall=mmc dev 1;\
- mmc read 0x88000002 0 1;\
- setenv validparts true;\
- test -e mmc 1:2 eMMCboot.bin || setenv validparts false && echo "eMMCboot.bin not present on SD partition 2";\
- if run validparts && itest.b *0x880001c4 != 0x41; then echo "SD partition 1 is not a PReP Boot partition"; setenv validparts false; fi;\
- if run validparts && itest.l *0x880001c8 != 0x280; then echo "SD partition 1 does not start at 320KiB for U-Boot"; mmc part; exit; fi;\
- if run validparts && itest.l *0x880001cc != 0x400; then echo "SD partition 1 is not 512KiB in size for U-Boot"; mmc part; exit; fi;\
- if run validparts && itest.b *0x880001d4 != 0x0c; then echo "SD partition 2 is not a FAT32 partition"; setenv validparts false; fi;\
- if run validparts && itest.b *0x880001e4 != 0x83; then echo "SD partition 3 is not a Linux partition"; setenv validparts false; fi;\
- setexpr.l part2_start *0x880001d8;setexpr.l part2_len *0x880001dc;setexpr.l part3_start *0x880001e8;setexpr.l part3_len *0x880001ec;\
- if run validparts && test 0x${part2_start} -gt ${maxsect}; then echo "SD partition 2 start too high"; setenv validparts false; fi;\
- if run validparts && test 0x${part2_len} -gt ${maxsect}; then echo "SD partition 2 is too large"; setenv validparts false; fi;\
- if run validparts && test 0x${part3_start} -gt ${maxsect}; then echo "SD partition 3 start too high"; setenv validparts false; fi;\
- if run validparts && test 0x${part3_len} -gt ${maxsect}; then echo "SD partition 2 is too large"; setenv validparts false; fi;\
- setexpr.l part2_end 0x$(part2_start} + 0x${part2_len};setexpr.l part3_end 0x${part3_start} + 0x${part3_len};\
- if run validparts && test 0x${part2_end} -ge ${maxsect}; then echo "SD partition 2 end too high"; setenv validparts false; fi;\
- if run validparts && test 0x${part3_end} -ge ${maxsect}; then echo "SD partition 3 end too high"; setenv validparts false; fi;
-
-# Copy a single chunk, up to 0x8000 sectors / 16MiB, from SD to eMMC at the specified offset.
-writechunk=setenv thislen 8000; if test 0x${partlen} -lt 0x${thislen}; then setenv thislen ${partlen};fi;\
- mmc dev 1;mmc read ${loadaddr} 0x${partofs} 0x${thislen};\
- mmc dev 0; mmc write ${loadaddr} 0x${partofs} 0x${thislen};\
- setexpr partofs 0x${partofs} + 0x${thislen};setexpr partlen 0x${partlen} - 0x${thislen}
-
-# Copy a partition defined by ${partofs} / ${partlen} from SD to eMMC
-writepart=while test 0x${partlen} -ne 0; do run writechunk; done
-
-# Configure the eMMC boot partition and write eMMCboot.bin to it
-writeboot=mmc partconf 0 1 1 0;fatload mmc 1:2 ${loadaddr} eMMCboot.bin;\
- setexpr filesize ${filesize} + 0x1ff;setexpr blocks ${filesize} / 0x200;\
- mmc dev 0 1;mmc write ${loadaddr} 0 ${blocks}
-
-# Install OpenWrt from the SD card to internal eMMC.
-doinstall=run checkinstall;if run validparts;then run writeboot;\
- echo "Copying preloader and U-Boot";setenv partofs 0;setenv partlen 680;run writepart;\
- echo "Copying FAT boot partition";setenv partofs ${part2_start};setenv partlen ${part2_len};run writepart;\
- echo "Copying root partition";setenv partofs ${part3_start};setenv partlen ${part3_len};run writepart;\
- echo "Installed OpenWrt to eMMC";setenv bootedfrom eMMC;run runbootmenu;fi
diff --git a/target/linux/mediatek/mt7623/base-files/lib/preinit/79_move_config b/target/linux/mediatek/mt7623/base-files/lib/preinit/79_move_config
index f47894c0fd..9dfb06bd81 100644
--- a/target/linux/mediatek/mt7623/base-files/lib/preinit/79_move_config
+++ b/target/linux/mediatek/mt7623/base-files/lib/preinit/79_move_config
@@ -6,9 +6,6 @@ move_config() {
local partdev partnum
case $(board_name) in
- bananapi,bpi-r2)
- partnum=2
- ;;
unielec,u7623-02-emmc-512m)
if grep -q root=/dev/mmcblk0p2 /proc/cmdline; then
partnum=1;
diff --git a/target/linux/mediatek/mt7623/base-files/lib/upgrade/platform.sh b/target/linux/mediatek/mt7623/base-files/lib/upgrade/platform.sh
index d3da22d496..4564bc61dd 100755
--- a/target/linux/mediatek/mt7623/base-files/lib/upgrade/platform.sh
+++ b/target/linux/mediatek/mt7623/base-files/lib/upgrade/platform.sh
@@ -1,5 +1,6 @@
REQUIRE_IMAGE_METADATA=1
+RAMFS_COPY_BIN='blockdev'
# Full system upgrade including preloader for MediaTek SoCs on eMMC or SD
mtk_mmc_full_upgrade() {
@@ -83,7 +84,18 @@ platform_do_upgrade() {
case "$board" in
bananapi,bpi-r2)
- mtk_mmc_full_upgrade "$1"
+ export_bootdevice
+ export_partdevice rootdev 0
+ export_partdevice fitpart 3
+ [ "$fitpart" ] || return 1
+ dd if=/dev/zero of=/dev/$fitpart bs=4096 count=1 2>/dev/null
+ blockdev --rereadpt /dev/$rootdev
+ get_image "$1" | dd of=/dev/$fitpart
+ blockdev --rereadpt /dev/$rootdev
+ local datapart=$(get_partition_by_name $rootdev "rootfs_data")
+ [ "$datapart" ] || return 0
+ dd if=/dev/zero of=/dev/$datapart bs=4096 count=1 2>/dev/null
+ echo $datapart > /tmp/sysupgrade.datapart
;;
unielec,u7623-02-emmc-512m)
@@ -126,32 +138,10 @@ platform_check_image() {
case "$board" in
bananapi,bpi-r2)
- [ "$magic" != "53444d4d" ] && {
+ [ "$magic" != "d00dfeed" ] && {
echo "Invalid image type."
return 1
}
- export_bootdevice && export_partdevice diskdev 0 || {
- echo "Unable to determine upgrade device"
- return 1
- }
-
- get_partitions "/dev/$diskdev" bootdisk
-
- #extract the boot sector from the image
- get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
-
- get_partitions /tmp/image.bs image
-
- #compare tables
- diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
-
- rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
-
- if [ -n "$diff" ]; then
- echo "Partition layout has changed. Full image will be written."
- ask_bool 0 "Abort" && exit 1
- return 0
- fi
;;
unielec,u7623-02-emmc-512m)
# Can always upgrade to the new-style full image
@@ -180,9 +170,19 @@ platform_check_image() {
return 0
}
+platform_copy_config_mmc() {
+ [ -e "$UPGRADE_BACKUP" ] || return
+ local datapart=$(cat /tmp/sysupgrade.datapart)
+ [ "$datapart" ] || echo "no rootfs_data partition, cannot keep configuration." >&2
+ dd if="$UPGRADE_BACKUP" of=/dev/$datapart
+ sync
+}
+
platform_copy_config() {
case "$(board_name)" in
- bananapi,bpi-r2|\
+ bananapi,bpi-r2)
+ platform_copy_config_mmc
+ ;;
unielec,u7623-02-emmc-512m)
# platform_do_upgrade() will have set $recoverydev
if [ -n "$recoverydev" ]; then
diff --git a/target/linux/mediatek/mt7623/config-5.10 b/target/linux/mediatek/mt7623/config-5.10
index 4a43b51675..ca1f92ae78 100644
--- a/target/linux/mediatek/mt7623/config-5.10
+++ b/target/linux/mediatek/mt7623/config-5.10
@@ -229,6 +229,7 @@ CONFIG_HARDIRQS_SW_RESEND=y
CONFIG_HAS_DMA=y
CONFIG_HAS_IOMEM=y
CONFIG_HAS_IOPORT_MAP=y
+CINFIG_HAVE_ARM_ARCH_TIMER=y
CONFIG_HAVE_SMP=y
CONFIG_HDMI=y
CONFIG_HIGHMEM=y
diff --git a/target/linux/mediatek/patches-5.10/160-dts-mt7623-bpi-r2-earlycon.patch b/target/linux/mediatek/patches-5.10/160-dts-mt7623-bpi-r2-earlycon.patch
new file mode 100644
index 0000000000..bd386c8420
--- /dev/null
+++ b/target/linux/mediatek/patches-5.10/160-dts-mt7623-bpi-r2-earlycon.patch
@@ -0,0 +1,11 @@
+--- a/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
++++ b/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
+@@ -19,7 +19,7 @@
+
+ chosen {
+ stdout-path = "serial2:115200n8";
+- bootargs = "console=ttyS2,115200n8";
++ bootargs = "earlycon=uart8250,mmio32,0x11004000 console=ttyS2,115200n8";
+ };
+
+ connector {
diff --git a/target/linux/mediatek/patches-5.10/161-dts-mt7623-bpi-r2-mmc-device-order.patch b/target/linux/mediatek/patches-5.10/161-dts-mt7623-bpi-r2-mmc-device-order.patch
new file mode 100644
index 0000000000..d1bafc1526
--- /dev/null
+++ b/target/linux/mediatek/patches-5.10/161-dts-mt7623-bpi-r2-mmc-device-order.patch
@@ -0,0 +1,11 @@
+--- a/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
++++ b/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts
+@@ -15,6 +15,8 @@
+
+ aliases {
+ serial2 = &uart2;
++ mmc0 = &mmc0;
++ mmc1 = &mmc1;
+ };
+
+ chosen {
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