This series supports chainloaded U-Boot on Android devices where the
previous stage bootloader (e.g. Android ABL) hands off a kernel
command line via /chosen/bootargs. Some of those parameters need to
be carried over into U-Boot's own $bootargs, while others such as
skip_initramfs need to be explicitly dropped before the command
line reaches the kernel.
Therefore this series adds a small command-line utility library
and uses it to carry over and filter the inherited bootargs.
Four patches:
1. common: Add command line parsing utilities
Parse key=value parameters out of a command-line string.
2. common: Add command line parameter masking functionality
Mask or drop individual parameters from a command-line string.
3. common: Add Android bootloader parameter parsing helper
Convenience wrapper for the numerous androidboot.* parameters.
4. arm: carry previous bootloader's bootargs into $bootargs
Wire the above utilities into the boot path. Copy the previous
bootloader's /chosen/bootargs into $bootargs. Drop parameters
that must not survive the handoff (e.g. skip_initramfs)
when CONFIG_SAVE_PREV_BL_BOOTARGS is enabled.
Signed-off-by: Petr Hodina <[email protected]>
---
Petr Hodina (4):
common: Add command line parsing utilities
common: Add command line parameter masking functionality
common: Add Android bootloader parameter parsing helper
arm: carry previous bootloader's bootargs into $bootargs
MAINTAINERS | 6 +
arch/arm/lib/save_prev_bl_data.c | 15 +-
boot/Kconfig | 8 +
include/cmdline_utils.h | 60 +++++++
lib/Makefile | 1 +
lib/cmdline_utils.c | 331 +++++++++++++++++++++++++++++++++++++++
6 files changed, 420 insertions(+), 1 deletion(-)
---
base-commit: ece349ade2973e220f524ce59e59711cc919263f
change-id: 20260909-b4-android-bootargs-carryover-3ebbc6685ba6
Best regards,
--
Petr Hodina <[email protected]>
