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Feature: Add optional delay before booting via fastboot boot #467

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merged 1 commit into from
Dec 21, 2024
Merged

Feature: Add optional delay before booting via fastboot boot #467

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5 changes: 5 additions & 0 deletions Documentation/building.md
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Original file line number Diff line number Diff line change
Expand Up @@ -66,6 +66,11 @@ to override the version (i.e. if you want to package lk2nd build), set this vara
By setting this option to 1 lk2nd will always enter the menu upon boot instead of
continuing with the usual workflow. This is useful for debugging and development.

#### `LK2ND_FASTBOOT_DELAY=` - Add delay before booting via `fastboot boot` (ms)

This can help with debugging on devices with carkit uart.
You need to switch the cable before starting linux to see all the logs.

### lk2nd specific

#### `LK2ND_ADTBS=`, `LK2ND_QCDTBS=`, `LK2ND_DTBS=` - Only build listed dtbs
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6 changes: 6 additions & 0 deletions app/aboot/aboot.c
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Expand Up @@ -3466,6 +3466,12 @@ void cmd_boot(const char *arg, void *data, unsigned sz)
fastboot_okay("");
fastboot_stop();

#ifdef LK2ND_FASTBOOT_DELAY
/* This can help with debugging on devices with carkit uart. You need to switch the cable before starting linux to see all the logs */
dprintf(INFO, "Waiting %ums before boot\n", LK2ND_FASTBOOT_DELAY);
thread_sleep(LK2ND_FASTBOOT_DELAY);
#endif

boot_linux((void*) hdr->kernel_addr, (void*) hdr->tags_addr,
(const char*) hdr->cmdline, board_machtype(),
(void*) hdr->ramdisk_addr, hdr->ramdisk_size,
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4 changes: 4 additions & 0 deletions lk2nd/project/base.mk
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Expand Up @@ -56,6 +56,10 @@ ifeq ($(LK2ND_FORCE_FASTBOOT), 1)
DEFINES += LK2ND_FORCE_FASTBOOT=1
endif

ifdef LK2ND_FASTBOOT_DELAY
DEFINES += LK2ND_FASTBOOT_DELAY=$(LK2ND_FASTBOOT_DELAY)
endif

# Keep the kernel command line clean when booting other operating systems
DEFINES += GENERATE_CMDLINE_ONLY_FOR_ANDROID=1

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