From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marek Behun <marek.behun@nic.cz>
Date: Thu, 4 Mar 2021 16:59:56 +0100
Subject: [RFC PATCH u-boot 00/12] U-Boot LTO (Sandbox + ARM Nokia RX-51)
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On Thu, 4 Mar 2021 09:07:33 -0600
Adam Ford <aford173@gmail.com> wrote:

> Interesting.  with LTO enabled, the DRAM reports 7.2 GB and hangs.
> Without LTO, U-Boot boots fine.
> 
> LTO:
> OMAP3630/3730-GP ES1.2, CPU-OPP2, L3-200MHz, Max CPU Clock 1 GHz
> Model: LogicPD Zoom DM3730 Torpedo + Wireless Development Kit
> Logic DM37x/OMAP35x reference board + LPDDR/NAND
> DRAM:  7.2 GiB
> <hang>
> 
> Without LTO:
> OMAP3630/3730-GP ES1.2, CPU-OPP2, L3-200MHz, Max CPU Clock 1 GHz
> Model: LogicPD Zoom DM3730 Torpedo + Wireless Development Kit
> Logic DM37x/OMAP35x reference board + LPDDR/NAND
> DRAM:  256 MiB
> NAND:  512 MiB
> MMC:   OMAP SD/MMC: 0
> Loading Environment from NAND... OK
> OMAP die ID: 619e00029ff800000168300f1502501f
> Net:   smc911x-0
> Hit any key to stop autoboot:  0
> OMAP Logic #

In which file is the code for determining dram for this board?
Try adding
CFLAGS_REMOVE_file.o := $(LTO_CFLAGS)
to Makefile in the directory where the file is located.

Marek