x86: video: Add debug option to time the BIOS copy

This can be very slow - typically 80ms even on a fast machine since it uses
the SPI flash to read the data. Add an option to display the time taken.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

diff --git a/drivers/pci/pci_rom.c b/drivers/pci/pci_rom.c
index 9808bb385e85d6f9d1bf9474b5d755d18d8d89a4..5ba315b2ad489aae209f37bcc34102ee543bafba 100644 (file)
--- a/drivers/pci/pci_rom.c
+++ b/drivers/pci/pci_rom.c
@@ -156,6 +156,8 @@ int pci_rom_load(uint16_t class, struct pci_rom_header *rom_header,
 
        target = (void *)PCI_VGA_RAM_IMAGE_START;
        if (target != rom_header) {
+               ulong start = get_timer(0);
+
                debug("Copying VGA ROM Image from %p to %p, 0x%x bytes\n",
                      rom_header, target, rom_size);
                memcpy(target, rom_header, rom_size);
@@ -163,6 +165,7 @@ int pci_rom_load(uint16_t class, struct pci_rom_header *rom_header,
                        printf("VGA ROM copy failed\n");
                        return -EFAULT;
                }
+               debug("Copy took %lums\n", get_timer(start));
        }
        *ram_headerp = target;