arm: spear: Return to BootROM if failing to boot from the main device

Overload the weak function board_boot_order() so that besides choosing
the main boot device, we can fallback on USB boot by returning in the
BootROM, eg. if the NOR flash is empty while it was the primary boot
medium.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Stefan Roese <sr@denx.de>

diff --git a/arch/arm/cpu/arm926ejs/spear/spl.c b/arch/arm/cpu/arm926ejs/spear/spl.c
index b2cacf2..fc332fb 100644 (file)
--- a/arch/arm/cpu/arm926ejs/spear/spl.c
+++ b/arch/arm/cpu/arm926ejs/spear/spl.c
@@ -241,6 +241,18 @@ u32 spl_boot_device(void)
        return mode;
 }
 
+void board_boot_order(u32 *spl_boot_list)
+{
+       spl_boot_list[0] = spl_boot_device();
+
+       /*
+        * If the main boot device (eg. NOR) is empty, try to jump back into the
+        * BootROM for USB boot process.
+        */
+       if (USB_BOOT_SUPPORTED)
+               spl_boot_list[1] = BOOT_DEVICE_BOOTROM;
+}
+
 void board_init_f(ulong dummy)
 {
        struct misc_regs *misc_p = (struct misc_regs *)CONFIG_SPEAR_MISCBASE;