Hi, Marvell MV64460 only supports burst reads/writes on 32bits width peripherals ;-( I have the same issue with a Lauterbach probe. You must deny burst on BootCS if this peripheral is not 32bits width ! This restriction also penalize boot process ! If your boot flash is 16 or 8 bits witdh, you can't directly execute instructions in flash. Because CPU like MPC74xx always load instructions with burst reads.
Regards. Sebastien.
Message: 5 Date: Sun, 1 Oct 2006 20:19:12 +0200 From: "Roel Loeffen" roel.loeffen@prodrive.nl Subject: [U-Boot-Users] MV64460 Burst reads from BootCS To: u-boot-users@lists.sourceforge.net Message-ID:
7826EB01AD927140A1DCF898FE63325D0D91B1@ExchangeSrv.Prodrive.nl
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Hi all,
We discover some serious problems accessing flash at BootCS of the Marvell MV64460. It looks like burst reads make the whole bridge hang. >From inside U-Boot as well as using only the BDI2000 debugger.
Reading the flash with bursts enabled (which is default), makes it sometimes impossible to access any registers/dram/devices anymore, only zeros can be read.
It also freezes the CPU somehow the debugger cannot halt it anymore with a normal halt (COP halt), it has to use COP freeze to take over control again.
I cannot say this problem does not occur accessing other spaces, so it can also be a problem at the PPC60x bus.
Has anyone over excpirianced this before?
Thanks in advance!
Roel
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