Hello,
I want to share what I found, mading some experiment with dram setting,
following the A10_DRAM_Controller_Calibration on the wiki.
First of all, I've patched the a10-dram-timings-calculator, adding the
definition for olinuxino-a20-micro in the a10-dram-info.rb:
"A20-OLinuXino-Micro" => {
url: "http://linux-sunxi.org/Olimex_A20-OLinuXino-Micro";,
dram_size: 1024,
dram_chip: MEM4G16D3EABG_125,
dram_para: {
zq: 0x7f,
odt_en: 0,
tpr3: 0,
tpr4: 0,
emr1: 0x4,
}
And I hope is correct, because I just looked at the others definition and guess
the right value :-). Dram chip is the same of the lime version, so should be
right. The other values were copied from fex file.
Then I used the program for calculate dram setting, and tested them with
a10-tpr3-scan program, using u-boot-sunxi (ssvb github repo, missed definition
for olimex boards).
After some days of testing, I found a stable dram setting at 432Mhz:
static struct dram_para dram_para = { /* DRAM timings: 7-6-6-16 (432 MHz) */
.clock = 432,
.type = 3,
.rank_num = 1,
.density = 4096,
.io_width = 16,
.bus_width = 32,
.cas = 7,
.zq = 0x7f,
.odt_en = 0,
.tpr0 = 0x2a906690,
.tpr1 = 0xa068,
.tpr2 = 0x22e00,
.tpr3 = 0x21111,
.tpr4 = 0x0,
.tpr5 = 0x0,
.emr1 = 0x4,
.emr2 = 0x8,
.emr3 = 0x0,
};
I've also tried 456Mhz, with no lucks. Seems to find a stable ragion around
tpr3=0x71111, but still sometimes crash with lima-tester when it tried the 100
loops test.
If someone needs it, I can upload somewhere the report.hml of this tests.
--
Diego Roversi <[email protected]>
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