i.MX Processors中的主题 Re: i.MX6UL QuadSPI Flash Memory Map

i.MX6UL QuadSPI Flash Memory Map

j_araya — Wed, 20 Mar 2019 11:21:11 GMT

Dear Community,

I would like to ask whether the U-Boot must reside in a specific address of the flash memory, so that it can be found by the Primary Program Loader, which is hard-coded in the processor's ROM?

I found in the i.MX Linux® User's Guide that U-Boot starts at 0x60000000, but I didn't find whether this value is actually hard-coded in the processor's ROM or whether it can be customized.

My motivation to this question is that we need to allocate space in the same flash device for the Spartan7 FPGA of our system. As far as I know the FPGA can address the flash to get its bitstream from any location, my question is whether the i.MX6UL can do something similar with the U-Boot?

Thanks!

Jose

Re: i.MX6UL QuadSPI Flash Memory Map

art — Fri, 22 Mar 2019 10:26:13 GMT

0x60000000 is the starting address of the QSPI1 memory range, please refer to the Table 2-1 "System memory map" of the i.MX6UL Reference Manual document:

https://www.nxp.com/webapp/Download?colCode=IMX6ULRM

So, this address is built into the i.MX6UL hardware and cannot be customized.

Have a great day,
Artur

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Re: i.MX6UL QuadSPI Flash Memory Map

j_araya — Fri, 22 Mar 2019 10:53:28 GMT

art‌

Thanks for answareing! Now I got the relation between the 0x60000000 address in the system memory map and the 0x1000 offset within the Flash itself to locate the IVT. This location is hard-coded in the boot ROM of the i.MX6UL processor.

For reference I paste here the fixed location of the IVT for some boot devices:

Taken from https://www.nxp.com/webapp/Download?colCode=IMX6ULRM as well.

Thanks again,

Jose