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Support rootwait cmdline parameter on legacy SAR

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On devices where the primary storage is slow to probe it makes sense to
wait forever for the system partition to mount, this emulates the
kernel's behaviour when waiting for rootfs on SAR if the rootwait
parameter is supplied.

This issue was encountered with some SD cards on the Nintendo Switch.
This commit is contained in:
Billy Laws 2020-12-30 11:56:40 +00:00 committed by John Wu
parent 872ab2e99b
commit 947a7d6a2f
3 changed files with 23 additions and 14 deletions
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3
native/jni/init/getinfo.cpp
View File

@ -160,6 +160,8 @@ void load_kernel_info(cmdline *cmd) {
cmd->skip_initramfs = true;
} else if (key == "androidboot.force_normal_boot") {
cmd->force_normal_boot = value[0] == '1';
} else if (key == "rootwait") {
cmd->rootwait = true;
} else if (key == "androidboot.android_dt_dir") {
strcpy(cmd->dt_dir, value);
} else if (key == "androidboot.hardware") {
@ -174,6 +176,7 @@ void load_kernel_info(cmdline *cmd) {
LOGD("Kernel cmdline info:\n");
LOGD("skip_initramfs=[%d]\n", cmd->skip_initramfs);
LOGD("force_normal_boot=[%d]\n", cmd->force_normal_boot);
LOGD("rootwait=[%d]\n", cmd->rootwait);
LOGD("slot=[%s]\n", cmd->slot);
LOGD("dt_dir=[%s]\n", cmd->dt_dir);
LOGD("fstab_suffix=[%s]\n", cmd->fstab_suffix);

1
native/jni/init/init.hpp
View File

@ -5,6 +5,7 @@
struct cmdline {
bool skip_initramfs;
bool force_normal_boot;
bool rootwait;
char slot[3];
char dt_dir[64];
char fstab_suffix[32];

33
native/jni/init/mount.cpp
View File

@ -309,22 +309,27 @@ void SARBase::backup_files() {
void SARBase::mount_system_root() {
LOGD("Early mount system_root\n");
strcpy(blk_info.block_dev, "/dev/root");
// Try legacy SAR dm-verity
strcpy(blk_info.partname, "vroot");
auto dev = setup_block(false);
if (dev >= 0)
goto mount_root;
// Try NVIDIA naming scheme
strcpy(blk_info.partname, "APP");
dev = setup_block(false);
if (dev >= 0)
goto mount_root;
do {
// Try legacy SAR dm-verity
strcpy(blk_info.partname, "vroot");
auto dev = setup_block(false);
if (dev >= 0)
goto mount_root;
sprintf(blk_info.partname, "system%s", cmd->slot);
dev = setup_block(false);
if (dev >= 0)
goto mount_root;
// Try NVIDIA naming scheme
strcpy(blk_info.partname, "APP");
dev = setup_block(false);
if (dev >= 0)
goto mount_root;
sprintf(blk_info.partname, "system%s", cmd->slot);
dev = setup_block(false);
if (dev >= 0)
goto mount_root;
// Poll forever if rootwait was given in cmdline
} while (cmd->rootwait);
// We don't really know what to do at this point...
LOGE("Cannot find root partition, abort\n");