【分享】在XEN Dom0，target选择PSU，能读取寄存器 slcr_gdma

作者：hankf，Xilinx Employee

启动XEN后，测试ZDMA应用程序， 检查DMA的secure模式。打算在XSCT下读取寄存器 slcr_gdma。

如果target选择A53 #0，不能读取寄存器 slcr_gdma。

如果target选择PSU，能读取寄存器 slcr_gdma。

xsct% connect
tcfchan#1
xsct% target
1 PS TAP
2 PMU
3 PL
4 PSU
5 RPU
6 Cortex-R5 #0 (Halted)
7 Cortex-R5 #1 (Lock Step Mode)
8 APU
9 Cortex-A53 #0 (Running)
10 Cortex-A53 #1 (Running)
11 Cortex-A53 #2 (Running)
12 Cortex-A53 #3 (Running)
xsct% targ 4
xsct% stop
xsct% Info: Cortex-A53 #0 (target 9) Stopped at 0x241ebc (External Debug Request)
xsct% Info: Cortex-A53 #1 (target 10) Stopped at 0x241ebc (External Debug Request)
xsct% Info: Cortex-A53 #2 (target 11) Stopped at 0x241ebc (External Debug Request)
xsct% Info: Cortex-A53 #3 (target 12) Stopped at 0x241ebc (External Debug Request)
xsct% rrd
adma_ch0 adma_ch1 adma_ch2
... ... ... ...
vcu_slcr wdt alg_vcu_dec_top
alg_vcu_enc_top

xsct% target 9
xsct% rrd
r0: 0000000000000000 r1: 0000000000000000
... ... ... ...
pc: 0000000000241ebc cpsr: 600002c9
vfp sys 
acpu_gic

xsct% mrd 0xFD690050
xsct% Memory read error at 0xFD690050. MMU fault at VA 0xFD690050. Translation fault, first level
xsct% target 4
xsct% target
1 PS TAP
2 PMU
3 PL
4* PSU
5 RPU
6 Cortex-R5 #0 (Halted)
7 Cortex-R5 #1 (Lock Step Mode)
8 APU
9 Cortex-A53 #0 (Running)
10 Cortex-A53 #1 (Running)
11 Cortex-A53 #2 (Running)
12 Cortex-A53 #3 (Running)
xsct% mrd 0xFD690050
FD690050: 000000FF
xsct% con
Info: Cortex-A53 #0 (target 9) Running
Info: Cortex-A53 #1 (target 10) Running
Info: Cortex-A53 #2 (target 11) Running
Info: Cortex-A53 #3 (target 12) Running