On 2021/6/7 20:38, Marek Vasut wrote:
On 6/7/21 2:05 PM, Frieder Schrempf wrote:
From: Frieder Schrempf <frieder.schre...@kontron.de>
Some IPs have their accessible address space restricted by the
interconnect. Let's make sure U-Boot only ever uses the space below
the 4G address boundary (which is 3GiB big), even when the effective
available memory is bigger.
We implement board_get_usable_ram_top() for all i.MX8M SoCs, as the
whole family is affected by this.
Shouldn't only those specific IP drivers handle buffers in the 64bit
space somehow ? E.g. using a bounce buffer ?
That could cause extra mem copy. Bounce buffer would be good for systems
that take U-Boot as UEFI firmware, because U-Boot would be located at
high end, but in the middle just top of 4GB.
I not object this patch, but it also be good if bounce buffer be added
for improvement.
Reviewed-by: Peng Fan <peng....@nxp.com>
