qfw: Don't fail if setup data size is 0

Skip missing setup data (which is valid) rather than failing with an
error.

Cc: Bin Meng <bmeng.cn@gmail.com>
Cc: Simon Glass <sjg@chromium.org>
Reported-by: Andrew Walbran <qwandor@google.com>
Signed-off-by: Pierre-Clément Tosi <ptosi@google.com>

diff --git a/cmd/qfw.c b/cmd/qfw.c
index d586150..ccbc967 100644 (file)
--- a/cmd/qfw.c
+++ b/cmd/qfw.c
@@ -25,15 +25,17 @@ static int qemu_fwcfg_cmd_setup_kernel(void *load_addr, void *initrd_addr)
        qfw_read_entry(qfw_dev, FW_CFG_SETUP_SIZE, 4, &setup_size);
        qfw_read_entry(qfw_dev, FW_CFG_KERNEL_SIZE, 4, &kernel_size);
 
-       if (setup_size == 0 || kernel_size == 0) {
+       if (kernel_size == 0) {
                printf("warning: no kernel available\n");
                return -1;
        }
 
        data_addr = load_addr;
-       qfw_read_entry(qfw_dev, FW_CFG_SETUP_DATA,
-                      le32_to_cpu(setup_size), data_addr);
-       data_addr += le32_to_cpu(setup_size);
+       if (setup_size != 0) {
+               qfw_read_entry(qfw_dev, FW_CFG_SETUP_DATA,
+                              le32_to_cpu(setup_size), data_addr);
+               data_addr += le32_to_cpu(setup_size);
+       }
 
        qfw_read_entry(qfw_dev, FW_CFG_KERNEL_DATA,
                       le32_to_cpu(kernel_size), data_addr);