ppc/pnv: Use skiboot addresses to load kernel and ramfs

The current settings are useful to load large kernels (with debug) but
it moves the initrd image in a memory region not protected by
skiboot. If skiboot is compiled with DEBUG=1, memory poisoning will
corrupt the initrd.

Cc: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-Id: <20210126171059.307867-4-clg@kaod.org>
Reviewed-by: Murilo Opsfelder Araujo <muriloo@linux.ibm.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

hw/ppc/pnv.c

@@ -65,9 +65,9 @@
 #define FW_MAX_SIZE             (16 * MiB)
 
 #define KERNEL_LOAD_ADDR        0x20000000
-#define KERNEL_MAX_SIZE         (256 * MiB)
-#define INITRD_LOAD_ADDR        0x60000000
-#define INITRD_MAX_SIZE         (256 * MiB)
+#define KERNEL_MAX_SIZE         (128 * MiB)
+#define INITRD_LOAD_ADDR        0x28000000
+#define INITRD_MAX_SIZE         (128 * MiB)
 
 static const char *pnv_chip_core_typename(const PnvChip *o)
 {