On 11/28/2025 12:13 PM, Beleswar Padhi wrote:
The AM571x SoC has 1 GB DDR space. However on HS devices, the top
0x2500000 is used by PPA and is firewalled. We should reserve this
memory in device-tree so that U-Boot doesn't use that memory for
anything. Reserve the top 0x2600000 memory (aligned to 2MB as per page
size for ARM32) for the same.
Signed-off-by: Beleswar Padhi <[email protected]>
---
arch/arm/dts/am571x-idk.dts | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/arm/dts/am571x-idk.dts b/arch/arm/dts/am571x-idk.dts
index b3592b22a0c..0cbd8c8a685 100644
--- a/arch/arm/dts/am571x-idk.dts
+++ b/arch/arm/dts/am571x-idk.dts
@@ -20,6 +20,18 @@
reg = <0x0 0x80000000 0x0 0x40000000>;
};
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ ppa_firewall_memory_region: ppa-firewall-memory@bda00000 {
+ compatible = "shared-dma-pool";
+ reg = <0x00 0xbda00000 0x00 0x2600000>;
+ no-map;
+ };
+ };
You will lose this memory on GP device as well .
I suggest to have DT specific to HS device, or reserve this at run-time
after detecting HS device.
+
leds {
compatible = "gpio-leds";
cpu0-led {
