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+
+Get wrong rom when loading 2 different firmware to 2 cpu.
+Description of problem:
+HI, I'm trying to model a machine with 2 cortex-m7 cpu. The 2 CPUs have their own address spaces.
+and when loading rom to init sp and pc, the CPU1 would load the rom of CPU0, because it seems not check
+address space here.
+```c
+void *rom_ptr_for_as(AddressSpace *as, hwaddr addr, size_t size)
+{
+ /*
+ * Find any ROM data for the given guest address range. If there
+ * is a ROM blob then return a pointer to the host memory
+ * corresponding to 'addr'; otherwise return NULL.
+ *
+ * We look not only for ROM blobs that were loaded directly to
+ * addr, but also for ROM blobs that were loaded to aliases of
+ * that memory at other addresses within the AddressSpace.
+ *
+ * Note that we do not check @as against the 'as' member in the
+ * 'struct Rom' returned by rom_ptr(). The Rom::as is the
+ * AddressSpace which the rom blob should be written to, whereas
+ * our @as argument is the AddressSpace which we are (effectively)
+ * reading from, and the same underlying RAM will often be visible
+ * in multiple AddressSpaces. (A common example is a ROM blob
+ * written to the 'system' address space but then read back via a
+ * CPU's cpu->as pointer.) This does mean we might potentially
+ * return a false-positive match if a ROM blob was loaded into an
+ * AS which is entirely separate and distinct from the one we're
+ * querying, but this issue exists also for rom_ptr() and hasn't
+ * caused any problems in practice.
+ */
+ FlatView *fv;
+ void *rom;
+ hwaddr len_unused;
+ FindRomCBData cbdata = {};
+
+ /* Easy case: there's data at the actual address */
+ rom = rom_ptr(addr, size);
+ if (rom) {
+ return rom;
+ }
+```
+Steps to reproduce:
+1. create a machine with 2 cortex-m7 cores and their own rom/ram.
+2. Set different ram size for them. for example, cpu0 ram size:0x40000, cpu1 ram size:0x20000
+3. build firmware of 2 cpu. make sure the init SP(local at 0x0) is set to the top the ram.
+4. use command:
+```
+./qemu-system-arm -M mymachine -smp 2 \
+-device loader,file=./cpu0.elf,addr=0x0,cpu-num=0 \
+-device loader,file=./cpu1.elf,addr=0x0,cpu-num=1 \
+-serial stdio -serial tcp::5678,server=on,wait=off
+```
+to start this machine.
+
+5. the cpu1 will panic when it try to use stack:
+`qemu-system-arm: ../target/arm/cpu.h:2396: arm_is_secure_below_el3: Assertion failed.`
+
+
+Sorry that I'm not sure whether this is an issue or I did something wrong. So post it here.
+For local fix this problem, I add a func `rom_ptr_wit_as(addr,size,as)` to find a rom with addresspace check.
+Is it proper?
+Additional information:
+