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authorHeinrich Schuchardt <xypron.glpk@gmx.de>2019-05-12 20:16:25 +0200
committerHeinrich Schuchardt <xypron.glpk@gmx.de>2019-05-12 20:54:23 +0200
commite2d82f8b2a91fb3fa78345f935a93a6db575effa (patch)
treeeea712493fa5ce9cd1a2976bd7a3e47eb03c08b7 /cmd
parent7e92db810b814198d57b10d438f146f181417194 (diff)
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efi_loader: comments for efi_install_fdt()
Describe that efi_install_fdt() defaults to using the device tree indicated by environment variable fdtcontroladdr. ACPI tables and device trees are mutually exclusive. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Diffstat (limited to 'cmd')
-rw-r--r--cmd/bootefi.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 0b3c5cd..c19256e 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -196,11 +196,16 @@ static void *get_config_table(const efi_guid_t *guid)
/**
* efi_install_fdt() - install fdt passed by a command argument
+ *
+ * If fdt_opt is available, the device tree located at that memory address will
+ * will be installed as configuration table, otherwise the device tree located
+ * at the address indicated by environment variable fdtcontroladdr will be used.
+ *
+ * On architectures (x86) using ACPI tables device trees shall not be installed
+ * as configuration table.
+ *
* @fdt_opt: pointer to argument
* Return: status code
- *
- * If specified, fdt will be installed as configuration table,
- * otherwise no fdt will be passed.
*/
static efi_status_t efi_install_fdt(const char *fdt_opt)
{