[U-Boot] [PATCH] ARM: mx6: Add support for Kosagi Novena

[Nikolay Dimitrov]

Hi Marek,

On 8/29/2014 12:30 PM, Marek Vasut wrote:
> +static struct mx6_mmdc_calibration novena_mmdc_calib = {
> +	/* write leveling calibration determine */
> +	.p0_mpwldectrl0		= 0x00420048,
> +	.p0_mpwldectrl1		= 0x006f0059,
> +	.p1_mpwldectrl0		= 0x005a0104,
> +	.p1_mpwldectrl1		= 0x01070113,
> +	/* Read DQS Gating calibration */
> +	.p0_mpdgctrl0		= 0x437c040b,
> +	.p0_mpdgctrl1		= 0x0413040e,
> +	.p1_mpdgctrl0		= 0x444f0446,
> +	.p1_mpdgctrl1		= 0x044d0422,
> +	/* Read Calibration: DQS delay relative to DQ read access */
> +	.p0_mprddlctl		= 0x4c424249,
> +	.p1_mprddlctl		= 0x4e48414f,
> +	/* Write Calibration: DQ/DM delay relative to DQS write access */
> +	.p0_mpwrdlctl		= 0x42414641,
> +	.p1_mpwrdlctl		= 0x46374b43,
> +};
I think these values should be result of MMDC calibration. If they're 
hardcoded, some SO-DIMM modules will work, some won't.

> +static struct mx6_ddr_sysinfo novena_ddr_info = {
> +	/* Width of data bus: 0=16, 1=32, 2=64 */
> +	.dsize		= 2,
> +	/* Config for full 4GB range so that get_mem_size() works */
> +	.cs_density	= 32,	/* 32Gb per CS */
> +	/* Single chip select */
> +	.ncs		= 1,
> +	.cs1_mirror	= 0,
> +	.rtt_wr		= 1,	/* RTT_Wr = RZQ/4 */
> +	.rtt_nom	= 2,	/* RTT_Nom = RZQ/2 */
> +	.walat		= 3,	/* Write additional latency */
> +	.ralat		= 7,	/* Read additional latency */
> +	.mif3_mode	= 3,	/* Command prediction working mode */
> +	.bi_on		= 1,	/* Bank interleaving enabled */
> +	.sde_to_rst	= 0x10,	/* 14 cycles, 200us (JEDEC default) */
> +	.rst_to_cke	= 0x23,	/* 33 cycles, 500us (JEDEC default) */
> +};
ncs is hard-coded to 1, while there are available SO-DIMMS on the market 
which have 2 ranks. Novena is supposed to handle memory modules up to 
4GiB, which means that there's a high chance to have 2-rank module 
installed.

> +
> +static struct mx6_ddr3_cfg elpida_4gib_1600 = {
> +	.mem_speed	= 1600,
> +	.density	= 4,
> +	.width		= 64,
> +	.banks		= 8,
> +	.rowaddr	= 16,
> +	.coladdr	= 10,
> +	.pagesz		= 2,
> +	.trcd		= 1300,
> +	.trcmin		= 4900,
> +	.trasmin	= 3590,
> +};
Again, this should be read from SPD mem, not hard-coded.

And finally - thank you so much for putting the efforts to add support 
for the Novena open-source board!

Kind regards,
Nikolay