imx8mn: bootcount does not increment

[Fabio Estevam]

Hi,

When enabling bootcount on the imx8mm-evk like this:

--- a/configs/imx8mm_evk_defconfig
+++ b/configs/imx8mm_evk_defconfig
@@ -120,3 +120,5 @@ CONFIG_SDP_LOADADDR=0x40400000
 CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_SPL_USB_SDP_SUPPORT=y
 CONFIG_IMX_WATCHDOG=y
+CONFIG_BOOTCOUNT_LIMIT=y
+CONFIG_BOOTCOUNT_ENV=y

It works as expected, and the "bootcount" environment variable gets
incremented after a reset.

However, if I try the same on an imx8mn_evk, the "bootcount" variable
always stays at 1 and never increments.

Do you happen to have any idea as to why imx8mn behaves differently in
this aspect?

Thanks,

Fabio Estevam