Am 08.06.09 18:35 schrieb(en) Wolfram Sang:
Question: why is bank-width even relevant for a RAM device?The underlying map_ram-driver uses it once while erasing. The question remains if this is really needed?
Am 06.06.09 18:16 schrieb(en) Albrecht Dreß:
At least if the RAM is attached to the 5200's Local Plus Bus in 16-bit mode, no byte write accesses are allowed (byte /reads/ work, though). I have a tweak (which I will post next week) to address this case, which depends upon this setting.
To put this clearer: on '5200 based systems, the driver (more specific: the function inline_map_copy_to()) *must* know whether the hardware is connected in 8-bit or 16-bit mode to the Local Plus Bus, as byte writes (issued by memcpy_toio()) will fail for the latter setup (probably the same applies for byte and word writes in 32-bit mode).
IMHO, this information should be passed using the device tree. The "bank-width" seems to be an obvious choice for that.
Best, Albrecht.
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