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what is the difference between the device memory and the strongly-order memory ?

Note: This was originally posted on 21st June 2011 at http://forums.arm.com

Dear All,

       Both device and strongly-order memory are used to model memory-mapped peripherals and I/O locations in ARMv7 architecture. And the architecture specification says that both device and strongly-order memory should conform the following two rules:
       a).   all accesses occur at their program size.

.   the number of accesses is the number specified by the program.

       My question is what is the difference between the device memory and the strongly-order memory ? Does the access sequence of strongly-order memory should strictly conform the program order while the access sequence of device memory can be different to the program order?

      Can anyone give me some explanation? Thanks.

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0 Peter Harris over 12 years ago

Note: This was originally posted on 21st June 2011 at http://forums.arm.com

[color=#222222][size=2]> So, the order of accesses to the device memory should conform to the program order, am I right? [/size][/color]
Yes.
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0 Peter Harris over 12 years ago

Note: This was originally posted on 21st June 2011 at http://forums.arm.com

[color=#222222][size=2]> So, the order of accesses to the device memory should conform to the program order, am I right? [/size][/color]
Yes.
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0 mars over 11 years ago in reply to Peter Harris

device memory might not be in order if two access are written/read to/from different slaves.
please check: cortex-a device memory access order limited in some range?
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