On 2/24/22 20:50, Fabio Estevam wrote:
Hi Tim,
Sorry for resurrecting such an old thread.
On Fri, Sep 25, 2020 at 11:52 AM Tim Harvey <thar...@gateworks.com> wrote:
Greetings,
I'm working with an IMX8MM board that has 4GiB of DRAM. I've found
that in this configuration the MMC driver and FEC network driver
appear to have some issues with crossing the 4GiB address space. If I
tell U-Boot I have 3GiB everything is ok, but when I set it to 4GiB I
see the following:
MMC: FSL_SDHC: 0, FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... Error found for upper 32 bits
Error found for upper 32 bits
Error found for upper 32 bits
*** Warning - No block device, using default environment
In: serial
Out: serial
Err: serial
Net: DP83867
Warning: ethernet@30be0000 (eth0) using random MAC address - ea:22:3a:4d:8f:d5
eth0: ethernet@30be0000 [PRIME]
Hit any key to stop autoboot: 0
On the FEC ethernet side I don't see any errors reported but ping's
fail with 4GiB DRAM.
Yes, just noticed the "Error found for upper 32 bits" and FEC breakage
on an imx8mm iotgate board.
Is there any progress with regards to the support of 4GB of RAM on imx8mm?
If the IP doesn't support access above 32bit bus addresses, but
mmc_data->src/dst is above 4 GiB, use 'struct bounce_buffer' on that
buffer and let U-Boot "bounce" into 32bit space which the IP can handle
. Same thing for ethernet and other IPs with such limitations.
