docs(qemu-sbsa): describe what we get from QEMU
QEMU provides us with minimal information about hardware platform using
minimalistic DeviceTree. This is not a Linux DeviceTree. It is not even
a firmware DeviceTree.
Change-Id: I7b6cc5f53a4f78a9ed69bc7fc2fa1a69ea65428d
Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
diff --git a/plat/qemu/qemu_sbsa/sbsa_sip_svc.c b/plat/qemu/qemu_sbsa/sbsa_sip_svc.c
index 31c083f..da40c78 100644
--- a/plat/qemu/qemu_sbsa/sbsa_sip_svc.c
+++ b/plat/qemu/qemu_sbsa/sbsa_sip_svc.c
@@ -47,6 +47,20 @@
uintptr_t sbsa_get_gicd(void);
uintptr_t sbsa_get_gicr(void);
+/*
+ * QEMU provides us with minimal information about hardware platform using
+ * minimalistic DeviceTree. This is not a Linux DeviceTree. It is not even
+ * a firmware DeviceTree.
+ *
+ * It is information passed from QEMU to describe the information a hardware
+ * platform would have other mechanisms to discover at runtime, that are
+ * affected by the QEMU command line.
+ *
+ * Ultimately this device tree will be replaced by IPC calls to an emulated SCP.
+ * And when we do that, we won't then have to rewrite Normal world firmware to
+ * cope.
+ */
+
void read_cpuinfo_from_dt(void *dtb)
{
int node;