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This commit enables thresh dma mode as this forces to disable checksuming,
and chooses delay values which make the interface stable.
These changes are needed, because ROCK64 is faced with two problems:
1. tx checksuming does not work with packets larger than 1498,
2. the default delays for tx/rx are not stable when using 1Gbps connection.
Delays were found out with:
https://github.com/ayufan-rock64/linux-build/tree/master/recipes/gmac-delays-test
Signed-off-by: Kamil Trzciński <ayufan@ayufan.eu>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
It looks like either the current kernel or the hardware has reliability
issues when the gmac is actually running at 1GBit. In my test-case
it is not able to boot on a nfsroot at this speed, as the system
will always lose the connection to the nfs-server during boot, before
reaching any login prompt and not recover from this.
So until this is solved, limit the speed to 100MBit as with this the
nfsroot survives stress tests like an apt-get upgrade without problems.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
The ROCK64 is a credit card size 4K60P HDR Media Board Computer using the
Rockchip RK3328 Quad-Core ARM Cortex A53 64-Bit Processor and supporting
up to 4GB 1600MHz LPDDR3 memory. It provides eMMC module socket, MicroSD
Card slot, Pi-2 Bus, Pi-P5+ Bus, USB 3.0 and many others peripheral
devices interface for makers to integrate with sensors and devices.
The devicetree currently supports basic peripherals, with more to be
added later on.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
