[PATCH 3/3 v2] board: axy17lte: get board usable - add bootcmd and docs
Dzmitry Sankouski
dsankouski at gmail.com
Sun Jan 30 11:40:18 CET 2022
U-boot is intended to replace linux kernel in android boot image(ABL), and
it's FIT payload to replace initramfs file. The boot process is similar to
boot image with linux:
- android bootloader (ABL) unpacks android boot image
- ABL sets `linux,initrd-start property` in chosen node in unpacked FDT
- ABL sets x0 register to FDT address, and passes control to u-boot
- u-boot reads x0 register, and stores it in `prevbl_fdt_addr` env variable
- u-boot reads `linux,initrd-start` property,
and stores it in `prevbl_initrd_start_addr`
In this way, u-boot bootcmd relies on `prevbl_initrd_start_addr` env
variable, and boils down to `bootm $prevbl_initrd_start_addr`.
If more control on boot process is desired, pack a boot script in
FIT image, and put it to default configuration
What done:
- Rearrange defconfig option order
- Add CONFIG_SAVE_PREV_BL_* options
- Doc updates:
- remove wrong SBOOT memory corruption note, because
memory is changed during u-boot bringup process,
not by SBOOT
- put payload on ramdisk place in abl boot image
creation step
Signed-off-by: Dzmitry Sankouski <dsankouski at gmail.com>
---
Changes for v2:
- increase CONFIG_LMB_MAX_REGIONS and CONFIG_SYS_BOOTM_LEN
- change signed off line
- add CONFIG_SAVE_PREV_BL_FDT_ADDR. It's needed to boot
android
- change bootcmd to source bootscript from FIT image
for more flexibility
configs/a3y17lte_defconfig | 12 +++++++-----
configs/a5y17lte_defconfig | 13 ++++++++-----
configs/a7y17lte_defconfig | 13 ++++++++-----
doc/board/samsung/axy17lte.rst | 15 +++------------
include/configs/exynos78x0-common.h | 4 ++++
5 files changed, 30 insertions(+), 27 deletions(-)
diff --git a/configs/a3y17lte_defconfig b/configs/a3y17lte_defconfig
index ddc1801a59..e120263ec6 100644
--- a/configs/a3y17lte_defconfig
+++ b/configs/a3y17lte_defconfig
@@ -1,13 +1,13 @@
CONFIG_ARM=y
-CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
-CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_ARCH_EXYNOS=y
-CONFIG_SYS_TEXT_BASE=0x40001000
CONFIG_ARCH_EXYNOS7=y
CONFIG_TARGET_A3Y17LTE=y
+CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
+CONFIG_SYS_TEXT_BASE=0x40001000
+CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_NR_DRAM_BANKS=8
CONFIG_DEFAULT_DEVICE_TREE="exynos78x0-axy17lte"
-CONFIG_SYS_LOAD_ADDR=0x40001000
CONFIG_FIT=y
CONFIG_USE_PREBOOT=y
CONFIG_PREBOOT="echo Read pressed buttons status;KEY_VOLUMEUP=gpa20;KEY_HOME=gpa17;KEY_VOLUMEDOWN=gpa21;KEY_POWER=gpa00;PRESSED=0;RELEASED=1;if gpio input $KEY_VOLUMEUP; then setenv VOLUME_UP $PRESSED; else setenv VOLUME_UP $RELEASED; fi;if gpio input $KEY_VOLUMEDOWN; then setenv VOLUME_DOWN $PRESSED; else setenv VOLUME_DOWN $RELEASED; fi;if gpio input $KEY_HOME; then setenv HOME $PRESSED; else setenv HOME $RELEASED; fi;if gpio input $KEY_POWER; then setenv POWER $PRESSED; else setenv POWER $RELEASED; fi;"
@@ -16,4 +16,6 @@ CONFIG_HUSH_PARSER=y
CONFIG_CMD_GPIO=y
CONFIG_CMD_I2C=y
CONFIG_DM_I2C_GPIO=y
-CONFIG_PINCTRL_EXYNOS78x0=y
+CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR=y
+CONFIG_SAVE_PREV_BL_FDT_ADDR=y
+CONFIG_LMB_MAX_REGIONS=64
diff --git a/configs/a5y17lte_defconfig b/configs/a5y17lte_defconfig
index 2534ab0573..95fee179fd 100644
--- a/configs/a5y17lte_defconfig
+++ b/configs/a5y17lte_defconfig
@@ -1,18 +1,21 @@
CONFIG_ARM=y
-CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
-CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_ARCH_EXYNOS=y
-CONFIG_SYS_TEXT_BASE=0x40001000
CONFIG_ARCH_EXYNOS7=y
CONFIG_TARGET_A5Y17LTE=y
+CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
+CONFIG_SYS_TEXT_BASE=0x40001000
+CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_NR_DRAM_BANKS=12
CONFIG_DEFAULT_DEVICE_TREE="exynos78x0-axy17lte"
-CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_HUSH_PARSER=y
CONFIG_FIT=y
CONFIG_USE_PREBOOT=y
CONFIG_PREBOOT="echo Read pressed buttons status;KEY_VOLUMEUP=gpa20;KEY_HOME=gpa17;KEY_VOLUMEDOWN=gpa21;KEY_POWER=gpa00;PRESSED=0;RELEASED=1;if gpio input $KEY_VOLUMEUP; then setenv VOLUME_UP $PRESSED; else setenv VOLUME_UP $RELEASED; fi;if gpio input $KEY_VOLUMEDOWN; then setenv VOLUME_DOWN $PRESSED; else setenv VOLUME_DOWN $RELEASED; fi;if gpio input $KEY_HOME; then setenv HOME $PRESSED; else setenv HOME $RELEASED; fi;if gpio input $KEY_POWER; then setenv POWER $PRESSED; else setenv POWER $RELEASED; fi;"
# CONFIG_DISPLAY_CPUINFO is not set
-CONFIG_HUSH_PARSER=y
CONFIG_CMD_GPIO=y
CONFIG_CMD_I2C=y
CONFIG_DM_I2C_GPIO=y
+CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR=y
+CONFIG_SAVE_PREV_BL_FDT_ADDR=y
+CONFIG_LMB_MAX_REGIONS=64
diff --git a/configs/a7y17lte_defconfig b/configs/a7y17lte_defconfig
index a2d76377ab..5564ab51a2 100644
--- a/configs/a7y17lte_defconfig
+++ b/configs/a7y17lte_defconfig
@@ -1,18 +1,21 @@
CONFIG_ARM=y
-CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
-CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_ARCH_EXYNOS=y
-CONFIG_SYS_TEXT_BASE=0x40001000
CONFIG_ARCH_EXYNOS7=y
CONFIG_TARGET_A7Y17LTE=y
+CONFIG_SYS_CONFIG_NAME="exynos78x0-common"
+CONFIG_SYS_TEXT_BASE=0x40001000
+CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_SKIP_LOWLEVEL_INIT=y
CONFIG_NR_DRAM_BANKS=12
CONFIG_DEFAULT_DEVICE_TREE="exynos78x0-axy17lte"
-CONFIG_SYS_LOAD_ADDR=0x40001000
+CONFIG_HUSH_PARSER=y
CONFIG_FIT=y
CONFIG_USE_PREBOOT=y
CONFIG_PREBOOT="echo Read pressed buttons status;KEY_VOLUMEUP=gpa20;KEY_HOME=gpa17;KEY_VOLUMEDOWN=gpa21;KEY_POWER=gpa00;PRESSED=0;RELEASED=1;if gpio input $KEY_VOLUMEUP; then setenv VOLUME_UP $PRESSED; else setenv VOLUME_UP $RELEASED; fi;if gpio input $KEY_VOLUMEDOWN; then setenv VOLUME_DOWN $PRESSED; else setenv VOLUME_DOWN $RELEASED; fi;if gpio input $KEY_HOME; then setenv HOME $PRESSED; else setenv HOME $RELEASED; fi;if gpio input $KEY_POWER; then setenv POWER $PRESSED; else setenv POWER $RELEASED; fi;"
# CONFIG_DISPLAY_CPUINFO is not set
-CONFIG_HUSH_PARSER=y
CONFIG_CMD_GPIO=y
CONFIG_CMD_I2C=y
CONFIG_DM_I2C_GPIO=y
+CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR=y
+CONFIG_SAVE_PREV_BL_FDT_ADDR=y
+CONFIG_LMB_MAX_REGIONS=64
diff --git a/doc/board/samsung/axy17lte.rst b/doc/board/samsung/axy17lte.rst
index e84fefec70..b7f299d1c7 100644
--- a/doc/board/samsung/axy17lte.rst
+++ b/doc/board/samsung/axy17lte.rst
@@ -66,26 +66,17 @@ and is therefore SBOOT's payload.
It may be pure u-boot (with loading u-boot's payload from flash in mind),
or u-boot + u-boot's payload.
-It should be kept in mind, that SBOOT binary patches it's payload after loading
-in address range 0x401f8550-0x401f9280. Given SBOOT loads payload to 0x40001000,
-a range of 0x1f7550-0x1f8280 (2061648-2065024) in a payload file
-will be corrupted after loading to RAM.
-
Creating payload file
"""""""""""""""""""""
- Assemble FIT image for your kernel
-- Create a file for u-boot payload ``touch sboot-payload``
-- Write zeroes till 0x200000 address to be sure SBOOT won't corrupt your info
- ``dd if=/dev/zero of=sboot-payload bs=$((0x200000)) count=1``
-- Write u-boot to the start of the payload ``dd if=<u-boot.bin path> of=sboot-payload``
-- Write FIT image to payload from 0x200000 address
- ``dd if=<FIT image path> of=sboot-payload seek=1 bs=2M``
Creating android boot image
"""""""""""""""""""""""""""
Once payload created, it's time for android image::
- mkbootimg --base 0x40000000 --kernel_offset 0x00000000 --ramdisk_offset 0x01000000 --tags_offset 0x00000100 --pagesize 2048 --second_offset 0x00f00000 --kernel <sboot-payload path> -o uboot.img
+ uboot=<path to u-boot.bin file>
+ ramdisk=<path to FIT payload file>
+ mkbootimg --base 0x40000000 --kernel_offset 0x00000000 --ramdisk_offset 0x01000000 --tags_offset 0x00000100 --pagesize 2048 --second_offset 0x00f00000 --kernel "$uboot" --ramdisk "$ramdisk" -o uboot.img
Note, that stock Samsung bootloader ignores offsets, set in mkbootimg.
diff --git a/include/configs/exynos78x0-common.h b/include/configs/exynos78x0-common.h
index 8d3449f028..46efb16b65 100644
--- a/include/configs/exynos78x0-common.h
+++ b/include/configs/exynos78x0-common.h
@@ -40,6 +40,7 @@
#define CONFIG_SYS_SDRAM_BASE 0x40000000
#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_TEXT_BASE + SZ_2M - GENERATED_GBL_DATA_SIZE)
+#define CONFIG_SYS_BOOTM_LEN SZ_32M
/* DRAM Memory Banks */
#define SDRAM_BANK_SIZE (256UL << 20UL) /* 256 MB */
#define PHYS_SDRAM_1 CONFIG_SYS_SDRAM_BASE
@@ -85,6 +86,9 @@
#endif
#define EXTRA_ENV_SETTINGS \
+ /* Cannot use bootdelay > 0, because timer is not working */
+ "bootdelay=0\0" \
+ "bootcmd=source $prevbl_initrd_start_addr:bootscript\0" \
EXYNOS_DEVICE_SETTINGS \
EXYNOS_FDTFILE_SETTING \
MEM_LAYOUT_ENV_SETTINGS
--
2.20.1
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