add gpio led uart

hc

2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/arch/arm/mm/nommu.c
..
..
@@ -161,7 +161,7 @@
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 	mpu_setup();
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 	/* allocate the zero page. */
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-	zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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+	zero_page = (void *)memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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 	if (!zero_page)
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 		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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 		      __func__, PAGE_SIZE, PAGE_SIZE);