Hi,
On 19-05-15 12:56, 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)
That is a pretty old u-boot we're doing all sunxi u-boot development upstream
now:
http://git.denx.de/?p=u-boot.git;a=summary
And we are detecting the most important DRAM parameters (like bus-width)
automatically
now. The only thing you need to set really is the clock-speed. So I think that
giving upstream u-boot a try on your board is a good idea.
Regards,
Hans
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.
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