Thanks for the guidance @Hans. I'm trying to build Mainline U-Boot <http://linux-sunxi.org/Mainline_U-boot> now. Will post my progress here.
On Tuesday, May 19, 2015 at 2:56:30 PM UTC+4, sufi al hussaini hassani kamili raheemi wrote: > > I have a board that's got A20 with Samsung's SDRAM 'K4B1G1646G BCK0'. > > The problem I'm facing now is that I'm not able to get it to boot. I keep > getting the following on debug UART: > > U-Boot SPL 2014.04-10706-g36080eb (Aug 19 2014 - 16:42:16) > DRAM:Timeout initialising DRAM > > resetting ... > > .... (Repeats infinitely) > > > I suspected that the (old) '[dram_para]' in my FEX file was causing this, > as it was configured for 'K4B4G1646D' (which is widely used). > So, I edited the FEX file based on the info I could gather from the > SDRAM's datasheet. It now looks like this: > > > [dram_para] > dram_baseaddr = 0x40000000 > dram_clk = 384 > dram_type = 3 > dram_rank_num = 1 > dram_chip_density = 1024 > dram_io_width = 16 > dram_bus_width = 32 > dram_cas = 9 > dram_zq = 0x7f > dram_odt_en = 0 > dram_size = 256 > dram_tpr0 = 0x42d899b7 > dram_tpr1 = 0xa090 > dram_tpr2 = 0x22a00 > dram_tpr3 = 0x0 > dram_tpr4 = 0x0 > dram_tpr5 = 0x0 > dram_emr1 = 0x4 > dram_emr2 = 0x10 > dram_emr3 = 0x0 > > I tried booting with this but to no avail. The problem persists (same > error). > > I looked for ways to get the DRAM info directly from the hardware and > found meminfo in sunxi tools. > I was able to compile (and run) it (on a A20 based commercial board), but > I just can't figure out how to get it running on my board. > > Now, I'm confused- whether just setting the correct values in my FEX would > suffice or would I have to rebuild U-Boot. > I would appreciate if someone could point me in the right direction to > solve this problem. > > Thanks. > -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
