The Amlogic Meson GXBB/GXL/GXM secure monitor uses part of the memory space, this patch adds these reserved zones.
Without such reserved memory zones, running the following stress command : $ stress-ng --vm 16 --vm-bytes 128M --timeout 10s multiple times: Could lead to the following kernel crashes : [ 46.937975] Bad mode in Error handler detected on CPU1, code 0xbf000000 -- SError ... [ 47.058536] Internal error: Attempting to execute userspace memory: 8600000f [#3] PREEMPT SMP ... Instead of the OOM killer. Signed-off-by: Neil Armstrong <narmstr...@baylibre.com> --- arch/arm64/boot/dts/amlogic/meson-gx.dtsi | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) Changes since v4 at [5]: - Move start of ddr memory to reserved-memory node - Drop memory node move - Fix typo in sizes Changes since resent v2 at [4]: - Fix invalid comment of useable memory attributes Changes since original v2 at [3]: - Typo in commit 2GiB -> 1GiB, 4GiB -> 2GiB Changes since v2 at [2]: - Moved all memory node out of dtsi - Added comment about useable memory - Fixed comment about secmon reserved zone Changes since v1 at [1] : - Renamed reg into linux,usable-memory to ovveride u-boot memory - only kept secmon memory zone [1] http://lkml.kernel.org/r/20161212101801.28491-1-narmstr...@baylibre.com [2] http://lkml.kernel.org/r/1483105232-6242-1-git-send-email-narmstr...@baylibre.com [3] http://lkml.kernel.org/r/1484128128-22454-1-git-send-email-narmstr...@baylibre.com [4] http://lkml.kernel.org/r/1484128540-22662-1-git-send-email-narmstr...@baylibre.com [5] http://lkml.kernel.org/r/1484129414-23325-1-git-send-email-narmstr...@baylibre.com diff --git a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi index eada0b5..63d52b7 100644 --- a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi +++ b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi @@ -55,6 +55,24 @@ #address-cells = <2>; #size-cells = <2>; + reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + + /* 16 MiB reserved for Hardware ROM Firmware */ + hwrom: hwrom { + reg = <0x0 0x0 0x0 0x1000000>; + no-map; + }; + + /* 2 MiB reserved for ARM Trusted Firmware (BL31) */ + secmon: secmon { + reg = <0x0 0x10000000 0x0 0x200000>; + no-map; + }; + }; + cpus { #address-cells = <0x2>; #size-cells = <0x0>; -- 1.9.1
