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authorAndre Przywara <andre.przywara@arm.com>2019-07-15 09:04:27 +0100
committerAndre Przywara <andre.przywara@arm.com>2019-09-25 11:45:35 +0100
commit882c0ff6ba65800046a851735cc848b76810196a (patch)
tree80e452bc59fdcac0789260dd91a659773626cad1 /plat/rpi/rpi4/rpi4_bl31_setup.c
parent2b19e2f361ac9be69f0f19ed7a25b1a038d91fc3 (diff)
downloadtrusted-firmware-a-882c0ff6ba65800046a851735cc848b76810196a.tar.gz
rpi4: Cleanup memory regions, move pens to first page
Now that we have the SMP pens in the first page of DRAM, we can get rid of all the fancy RPi3 memory regions that our RPi4 port does not really need. This avoids using up memory all over the place, restricting ATF to just run in the first 512KB of DRAM. Remove the now unused regions. This also moves the SMP pens into our first memory page (holding the firmware magic), where the original firmware put them, but where there is also enough space for them. Since the pens will require code execution privileges, we amend the memory attributes used for that page to include write and execution rights. Change-Id: I131633abeb4a4d7b9057e737b9b0d163b73e47c6 Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Diffstat (limited to 'plat/rpi/rpi4/rpi4_bl31_setup.c')
-rw-r--r--plat/rpi/rpi4/rpi4_bl31_setup.c5
1 files changed, 2 insertions, 3 deletions
diff --git a/plat/rpi/rpi4/rpi4_bl31_setup.c b/plat/rpi/rpi4/rpi4_bl31_setup.c
index 8dfadf7306..f8bc259f23 100644
--- a/plat/rpi/rpi4/rpi4_bl31_setup.c
+++ b/plat/rpi/rpi4/rpi4_bl31_setup.c
@@ -197,10 +197,9 @@ void bl31_plat_arch_setup(void)
/*
* Add the first page of memory, which holds the stub magic,
* the kernel and the DT address.
- * This is read-only, as the GPU already populated the header,
- * we just need to read it.
+ * This also holds the secondary CPU's entrypoints and mailboxes.
*/
- mmap_add_region(0, 0, 4096, MT_MEMORY | MT_RO | MT_SECURE);
+ mmap_add_region(0, 0, 4096, MT_NON_CACHEABLE | MT_RW | MT_SECURE);
rpi3_setup_page_tables(BL31_BASE, BL31_END - BL31_BASE,
BL_CODE_BASE, BL_CODE_END,