Hi Fabio,
On Tue, 22 Aug 2023 at 13:44, Fabio Estevam festevam@gmail.com wrote:
Hi Rogan,
On Tue, Aug 22, 2023 at 6:42 AM Rogan Dawes rogan@dawes.za.net wrote:
Hi Fabio,
As far as I am aware, the U-boot source for the Wink hub has not been made available anywhere. That said, the RAM chip in use on the board
Was there a formal request for the U-Boot source code to Wink?
As per the GPL license, they have to share the U-Boot source code.
I have just asked them for it, so let's see what happens. I'm not optimistic, though, given their financial troubles. I am not aware of anyone else asking them. However, I do believe that there have been requests for the kernel sources for the Wink Hub 2, which were ignored, suggesting that they are not the best GPL citizen.
is marked D9LPX, which apparently corresponds to the following item: https://media-www.micron.com/-/media/client/global/documents/products/data-s...
There is a tool from NXP that helps with the i.MX28 DDR2 controller initialization for a specific DDR model:
https://community.nxp.com/pwmxy87654/attachments/pwmxy87654/imx-processors/9...
The DDR initialization values obtained from this tool are then used in U-Boot inside the 'mxs_dram_vals' array.
There is a common DDR configuration at arch/arm/cpu/arm926ejs/mxs/spl_mem_init.c.
Most likely, in your case, it will require a custom mxs_dram_vals initialization, like it is done at board/liebherr/xea/spl_xea.c.
I did try to change the iomux_cfg_t as suggested above, built using make mx28evk_defconfig && make u-boot.sb, and used mxsldr to try load it, to no avail. There was no output on the serial port at all, or any other suggestion that anything was running.
It has been a long time since I used the mxsldr tool.
When time permits, I can try to load a recent U-Boot over USB using this tool on a imx28-evk.
Cheers
I think fiddling with RAM timings is a little more in the weeds than I am ready to go at this point. I did see this post (http://web.archive.org/web/20151005053615/http://jalderman.org/?p=348), suggesting that it was not too difficult to get it working using mainline u-boot. That said, I also note that some teardowns mention that the RAM is a Nanya part, while I have Micron, so perhaps I should not place too much reliance on that.
Rogan