On Tue, Apr 28, 2020 at 11:38:03AM +0200, Patrice Chotard wrote:
If dcache is switched OFF to ON state and if non-cached memory is used, this non-cached memory must be re-declared as uncached to mmu each time dcache is set ON.
Introduce noncached_set_region() to set this non-cached region's mmu settings. Let architecture override it by defining it as a weak function.
For ARM architecture, noncached_set_region() defines all noncached region as non-cacheable.
Issue found on STM32MP1 platform using dwc_eth_qos ethernet driver, when going from dcache OFF to dcache ON state, ethernet driver issued TX timeout errors when performing dhcp or ping.
It can be reproduced with the following sequence:
dhcp while true ; do ping 192.168.1.300 ; dcache off ; ping 192.168.1.300 ; dcache on ; done
Signed-off-by: Patrice Chotard patrice.chotard@st.com Cc: Marek Vasut marex@denx.de Cc: Joe Hershberger joe.hershberger@ni.com Cc: Ramon Fried rfried.dev@gmail.com Cc: Stephen Warren swarren@nvidia.com Reviewed-by: Marek Vasut marex@denx.de
Applied to u-boot/master, thanks!