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@@ -309,7 +309,7 @@ __weak int mach_cpu_init(void)
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/* Get the top of usable RAM */
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__weak ulong board_get_usable_ram_top(ulong total_size)
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{
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-#ifdef CONFIG_SYS_SDRAM_BASE
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+#if defined(CONFIG_SYS_SDRAM_BASE) && CONFIG_SYS_SDRAM_BASE > 0
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/*
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* Detect whether we have so much RAM that it goes past the end of our
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* 32-bit address space. If so, clip the usable RAM so it doesn't.
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