[PATCH v5 7/8] configs: add qcom_lemans_snagboot_defconfig for Lemans-EVK

Add defconfig for booting U-Boot in Snagboot mode on Lemans-EVK. In
this mode, XBL loads U-Boot and directly jumps to it. U-Boot then
enters fastboot over USB for device provisioning.

Create a reusable config fragment at configs/qcom-snagboot.config
with common snagboot settings. Platform-specific defconfigs should
include this fragment along with their own settings.

Signed-off-by: Balaji Selvanathan <[email protected]>
---
Changes in v5:
- Disable I2C configs as its not required in Snagboot mode

Changes in v4:
- Use CONFIG_ENV_IS_NOWHERE
- Place Snagboot related configs in seperate config fragment
  called configs/qcom-snagboot.config
- Include above config fragment in
  configs/qcom_lemans_snagboot_defconfig

Changes in v3:
- Removed enabling QCOM_COMMAND_DB_OPTIONAL, ENABLE_ARM_SOC_BOOT0_HOOK
  and SKIP_RELOCATE as they are now automatically enabled by
  QCOM_SNAGBOOT_SUPPORT selection

Changes in v2:
- Newly introduced in v2
---
 configs/qcom-snagboot.config           | 46 ++++++++++++++++++++++++++++++++++
 configs/qcom_lemans_snagboot_defconfig | 18 +++++++++++++
 2 files changed, 64 insertions(+)

diff --git a/configs/qcom-snagboot.config b/configs/qcom-snagboot.config
new file mode 100644
index 00000000000..20b514a0a5d
--- /dev/null
+++ b/configs/qcom-snagboot.config
@@ -0,0 +1,46 @@
+# Common configuration fragment for Qualcomm snagboot mode
+# Include this in platform-specific snagboot defconfigs
+
+CONFIG_QCOM_SNAGBOOT_MODE=y
+
+# Disable configs that conflict with snagboot mode
+# CONFIG_PSCI_RESET is not set
+# CONFIG_SAVE_PREV_BL_INITRAMFS_START_ADDR is not set
+# CONFIG_IOMMU is not set
+# CONFIG_REBOOT_MODE_ENV_UPDATE is not set
+
+# PSCI firmware is not available in snagboot mode, so nothing implements
+# poweroff (neither SYSRESET_PSCI nor SYSRESET_CMD_POWEROFF are selected)
+# CONFIG_CMD_POWEROFF is not set
+
+# I2C peripherals aren't accessible in snagboot mode (no Command DB / RPMh
+# power-domain data from XBL), so probing them only produces noisy errors.
+# CONFIG_DM_I2C is not set
+# CONFIG_CMD_I2C is not set
+# CONFIG_SYS_I2C_QUP is not set
+# CONFIG_SYS_I2C_GENI is not set
+# CONFIG_I2C_MUX is not set
+# CONFIG_I2C_EEPROM is not set
+
+# Use default environment instead of loading from storage
+# This ensures snagboot mode works even with corrupted environment
+# CONFIG_ENV_IS_IN_SCSI is not set
+# CONFIG_ENV_IS_IN_MMC is not set
+# CONFIG_ENV_IS_IN_FLASH is not set
+# CONFIG_ENV_IS_IN_NAND is not set
+CONFIG_ENV_IS_NOWHERE=y
+
+# Disable default env file to use CONFIG_BOOTCOMMAND instead
+# CONFIG_ENV_USE_DEFAULT_ENV_TEXT_FILE is not set
+
+# Auto-enter fastboot mode for snagboot
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_BOOTCOMMAND="fastboot -l $fastboot_addr_r usb 0"
+CONFIG_BOOTDELAY=0
+
+# Fastboot configuration for partition flashing
+CONFIG_FASTBOOT_FLASH_BLOCK=y
+CONFIG_FASTBOOT_FLASH_BLOCK_INTERFACE_NAME="scsi"
+CONFIG_FASTBOOT_FLASH_BLOCK_DEVICE_ID=4
+CONFIG_FASTBOOT_GPT_NAME="gpt"
+CONFIG_FASTBOOT_MBR_NAME="mbr"
diff --git a/configs/qcom_lemans_snagboot_defconfig b/configs/qcom_lemans_snagboot_defconfig
new file mode 100644
index 00000000000..d6906c1e501
--- /dev/null
+++ b/configs/qcom_lemans_snagboot_defconfig
@@ -0,0 +1,18 @@
+# Configuration for building U-Boot for snagboot/recovery mode
+# on Lemans-EVK dev boards.
+#
+# For normal production boot, use qcom_lemans_defconfig instead.
+
+#include "qcom_defconfig"
+#include "qcom-snagboot.config"
+
+# Platform-specific settings for Lemans-EVK
+
+# Address where U-Boot will be loaded
+CONFIG_TEXT_BASE=0x1c100000
+CONFIG_REMAKE_ELF=y
+CONFIG_FASTBOOT_BUF_ADDR=0xdb300000
+CONFIG_DEFAULT_DEVICE_TREE="qcom/lemans-evk"
+
+# Timer frequency for Lemans platform
+CONFIG_COUNTER_FREQUENCY=19200000
\ No newline at end of file

-- 
2.34.1