On Tue, Apr 21, 2020 at 7:54 PM Jack Mitchell ml@embed.me.uk wrote:
Has anyone worked with an rk3399 based board with a single channel RAM setup? I've looked at the current code and made some changes for only setting up a single channel which basically consists of altering the loops down to one channel, however u-boot is hanging while checking for a successful frequency change here:
/* change freq */ writel((((0x3 << 4) | (1 << 2) | 1) << 16) | (fn << 4) | (1 << 2) | 1, &dram->cic->cic_ctrl0); while (!(readl(&dram->cic->cic_status0) & (1 << 2))) ;I believe this is due to waiting for both channels to switch frequency which will never happen as there is only a single channel setup.
Has anyone worked with a similar setup, or have any further documentation as the TRM only has a fairly basic register listing.
I have tried single-channel with DDR3 which is present on NOE4, I believe the existing code does handle single channel for LPDDR4, can you enable debugs and check on existing code. Usually the code cannot go and try channel 1.
Jagan.