x86: Support ROMs on other archs

We shouldn't assume that the VGA ROM can always be loaded at c0000. This
is only true on x86 machines.

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

arch/x86/include/asm/u-boot-x86.h

@@ -70,4 +70,6 @@ uint64_t timer_get_tsc(void);
 
 void quick_ram_check(void);
 
+#define PCI_VGA_RAM_IMAGE_START		0xc0000
+
 #endif	/* _U_BOOT_I386_H_ */

drivers/pci/pci_rom.c

@@ -157,7 +157,13 @@ int pci_rom_load(uint16_t class, struct pci_rom_header *rom_header,
 
 	rom_size = rom_header->size * 512;
 
+#ifdef PCI_VGA_RAM_IMAGE_START
 	target = (void *)PCI_VGA_RAM_IMAGE_START;
+#else
+	target = (void *)malloc(rom_size);
+	if (!target)
+		return -ENOMEM;
+#endif
 	if (target != rom_header) {
 		ulong start = get_timer(0);
 

include/pci_rom.h

@@ -8,7 +8,6 @@
 #define _PCI_ROM_H
 
 #define PCI_ROM_HDR			0xaa55
-#define PCI_VGA_RAM_IMAGE_START		0xc0000
 
 struct pci_rom_header {
 	uint16_t signature;