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[Qemu-devel] Proper PIDR values ???

From: Pavel Fedin
Subject: [Qemu-devel] Proper PIDR values ???
Date: Tue, 26 May 2015 12:12:34 +0300


> The value is taken from the gic-500 document in the re-distributer's table 
> (3-7).
> I don't know where the value 0x91 comes from as GICD_PIDR0 is 0x92, 
> GICR_PIDR0 is 0x93
> GITS_PIDR0 is 0x94.
> In the GICv3 document section 5.4.21  it is also been written:
> 0xFFE0  GICR_PIDR0 Bits [7:0]. Bits [7:0] of the ARM-defined DevID field. 
> This field is
0x93 in
> ARM implementations of a GICv3 or later Re-distributor.

 Hm, very interesting...
 Actually i still don't have architecture reference manual for GICv3. It's too 
slow and
problematic to request it in a big company because of bureaucracy issues. :) So 
try to get
around with:
a) Linux source code.
b) GIC-500 tech reference manual (from ARM InfoCenter)
c) Hardware manual for my board (which seems to contain a part from arch 
manual, with all
registers described). It's also under NDA, so i can't quote too much :)

 The doc (c) has this table regarding PIDR0[7:0] values for various things:
--- cut ---
PCC PIDR Part Number 0 Enumeration

0x0 NONE Reserved.
0x1 GICR GIC redistributor.
0x2 GICD GIC distributor.
0x4 GTI_BZ GTI base.
0x5 GTI_CC GTI counter control.
0x6 GTI_CTL GTI control.
0x7 GTI_RD GTI counter read.
0x8 GTI_WC GTI watchdog control.
 --- cut ---
 Linaro guys (Peter, Eric, Christoffer, anyone), please judge us, who is 

Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia

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