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fs_mgr: reorder getting boot config 

The params in kernel cmdline is expected to be consumed by kernel.
For bootloader <--> userland communication, we're moving it to
device-tree or system property.

Bug: 78615592
Test: boot a device
Change-Id: I26bc2ea4cda91241242eb9fd0210b5b10659a297
This commit is contained in:
Bowgo Tsai 2018-06-11 17:51:41 +08:00
parent ec9b6b73ff
commit 7481e6cceb
1 changed files with 15 additions and 15 deletions
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30
fs_mgr/fs_mgr_boot_config.cpp
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@ -84,24 +84,13 @@ bool fs_mgr_get_boot_config_from_kernel_cmdline(const std::string& key, std::str
return fs_mgr_get_boot_config_from_kernel(cmdline, key, out_val);
}
// Tries to get the boot config value in properties, kernel cmdline and
// device tree (in that order). returns 'true' if successfully found, 'false'
// otherwise
// Tries to get the boot config value in device tree, properties and
// kernel cmdline (in that order). Returns 'true' if successfully
// found, 'false' otherwise.
bool fs_mgr_get_boot_config(const std::string& key, std::string* out_val) {
FS_MGR_CHECK(out_val != nullptr);
// first check if we have "ro.boot" property already
*out_val = android::base::GetProperty("ro.boot." + key, "");
if (!out_val->empty()) {
return true;
}
// fallback to kernel cmdline, properties may not be ready yet
if (fs_mgr_get_boot_config_from_kernel_cmdline(key, out_val)) {
return true;
}
// lastly, check the device tree
// firstly, check the device tree
if (is_dt_compatible()) {
std::string file_name = get_android_dt_dir() + "/" + key;
if (android::base::ReadFileToString(file_name, out_val)) {
@ -112,5 +101,16 @@ bool fs_mgr_get_boot_config(const std::string& key, std::string* out_val) {
}
}
// next, check if we have "ro.boot" property already
*out_val = android::base::GetProperty("ro.boot." + key, "");
if (!out_val->empty()) {
return true;
}
// finally, fallback to kernel cmdline, properties may not be ready yet
if (fs_mgr_get_boot_config_from_kernel_cmdline(key, out_val)) {
return true;
}
return false;
}