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efi_loader: use hardware device tree by default

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If the bootefi command is called without passing the address of a device
tree, the internal device tree is used. For devices with a hardware device
tree it is preferable to used the hardware device tree in this case.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2019-12-04 12:31:12 +01:00
parent 7a597259d2
commit 753aa18f17
1 changed files with 14 additions and 8 deletions
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22
cmd/bootefi.c
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@ -200,14 +200,16 @@ static void *get_config_table(const efi_guid_t *guid)
*
* If fdt_addr 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.
* at the address indicated by environment variable fdt_addr or as fallback
* fdtcontroladdr will be used.
*
* On architectures using ACPI tables device trees shall not be installed as
* configuration table.
*
* @fdt_addr: address of device tree or EFI_FDT_USE_INTERNAL to use the
* internal device tree as indicated by environment variable
* fdtcontroladdr
* the hardware device tree as indicated by environment variable
* fdt_addr or as fallback the internal device tree as indicated by
* the environment variable fdtcontroladdr
* Return: status code
*/
static efi_status_t efi_install_fdt(uintptr_t fdt_addr)
@ -232,15 +234,19 @@ static efi_status_t efi_install_fdt(uintptr_t fdt_addr)
/* Look for device tree that is already installed */
if (get_config_table(&efi_guid_fdt))
return EFI_SUCCESS;
/* Use our own device tree as default */
fdt_opt = env_get("fdtcontroladdr");
/* Check if there is a hardware device tree */
fdt_opt = env_get("fdt_addr");
/* Use our own device tree as fallback */
if (!fdt_opt) {
printf("ERROR: need device tree\n");
return EFI_NOT_FOUND;
fdt_opt = env_get("fdtcontroladdr");
if (!fdt_opt) {
printf("ERROR: need device tree\n");
return EFI_NOT_FOUND;
}
}
fdt_addr = simple_strtoul(fdt_opt, NULL, 16);
if (!fdt_addr) {
printf("ERROR: invalid $fdtcontroladdr\n");
printf("ERROR: invalid $fdt_addr or $fdtcontroladdr\n");
return EFI_LOAD_ERROR;
}
}