Add requirement for preserving the PCIe ID routing as described in issue:
https://github.com/riscv/riscv-platform-specs/issues/81

Signed-off-by: Mayuresh Chitale <mchitale@...>
---
riscv-platform-spec.adoc | 2 ++
1 file changed, 2 insertions(+)

diff --git a/riscv-platform-spec.adoc b/riscv-platform-spec.adoc
index e06500d..289163c 100644
--- a/riscv-platform-spec.adoc
+++ b/riscv-platform-spec.adoc
@@ -825,6 +825,8 @@ supported PCIe domains and map the ECAM I/O region for each domain.
* Platform software must configure ECAM I/O regions such that the effective
memory attributes are that of a PMA I/O region (i.e. strongly-ordered,
non-cacheable, non-idempotent).
+* If the platform software (for e.g OS) re-enumerates the PCIe topology then it
+is required that the underlying fabric routing is always correctly preserved.

===== PCIe Memory Space
Platforms are required to map PCIe address space directly in the system address
--
2.17.1