hw/imc: don't access homer memory if it was not initialised
This can happen under mambo, at least.
@@ -154,6 +154,9 @@ static struct imc_chip_cb *get_imc_cb(uint32_t chip_id)
struct proc_chip *chip = get_chip(chip_id);
struct imc_chip_cb *cb;
+ if (!chip->homer_base)
+ return NULL; /* The No Homers Club */
+
cb = (struct imc_chip_cb *)(chip->homer_base + P9_CB_STRUCT_OFFSET);
if (!is_nest_mem_initialized(cb))
return NULL;
