disable CPC (L3) for T1040/T2080

[hv]

According to the reference manual, this is the sequence to disable CPC for T1040/T2080:

# a. Clear all bits in CPCPAR0-CPCPAR15 to prevent new transactions from allocating in the CPC

# b. Set CPCCSR0[CPCFL]

# c. Wait for CPCCSR0[CPCFL] to be cleared by hardware

# d. Clear CPCCSR0[CPCE]

in u-boot, I did this:

mw 0xfe010208 0x0; sleep 1; mw 0xfe010000 0xc0000800; sleep 5; mw 0xfe010000 0x0; sleep 1

is that correct?

Thanks!

[LPP]

The only remark is that you should clear 15 CPCPARn registers on the first step : 0xfe010208 - 0xfe0102e8

Have a great day,
Pavel

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[hv]

I found a document called “Cache Latencies of the PowerPC MPC7451” by Bill Brock/Michael Exerman. Is there similar document for the T1040 (e5500)/T2080 (e6500) processors?

Thanks!

[hv]

Thanks!

When L3 (CPC) is disabled for the T1040, the throughput seemed to get better (i.e. the code execute faster)! I’m confused! Is there an explanation for that?