Whether Armv7-A has a Write Buffer

The TRM mentions three types of buffers:

• linefill buffers
• eviction buffer
• store buffer

The last one is your write buffer.

It will merge writes from L/S unit to nearby memory locations.

It can be drained with a DSB.

See https://community.arm.com/tools/f/discussions/1031/armv7-34-write-buffer-34-issue

The TRM mentions three types of buffers:

• linefill buffers
• eviction buffer
• store buffer

The last one is your write buffer.

It will merge writes from L/S unit to nearby memory locations.

It can be drained with a DSB.

See https://community.arm.com/tools/f/discussions/1031/armv7-34-write-buffer-34-issue

OK.

Thank you very much.

I have another question. DMB is enough to drain store buffer, am I right?

DMB ensures ordering only.

It will not "wait" for the write buffer.

See https://community.arm.com/processors/f/discussions/3287/questions-regarding-dmb-dsb-and-isb

Thank you!