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93b785f5ae
When an Arm Ltd GIC (Arm GIC-[567]00) is instantiated with one or more ITSes, the ITS MMIO frames appear between the distributor and redistributor addresses. This makes the beginning of the redistributor region dependent on the existence and number of ITSes. To support various FPGA images, with and without ITSes, probe the addresses in question, to learn whether they accommodate an ITS or a redistributor. This can be safely done by looking at the PIDR[01] registers, which contain an ID code for each region, documented in the Arm GIC TRMs. We try to find all ITSes instantiated, and skip either two or four 64K frames, depending on GICv4.1 support. At some point we will find the first redistributor; this address we then update in the DTB. Change-Id: Iefb88c2afa989e044fe0b36b7020b56538c60b07 Signed-off-by: Andre Przywara <andre.przywara@arm.com>