allow to specify the ROM version explicitly

[hmvp]

Based on: https://github.com/benavrhm/kobs-ng-patches

This patch to kobs-ng allows you to specify the ROM version explicitly using a
command line parameter. For example "kobs-ng -r mx28 init ...".

Using this patch allows you to avoid the broken heuristic on /proc/cpuinfo
in src/plat_boot_config.c:discover_boot_rom_version() that results in the
lame message:

"Couldn't find Boot ROM version
We can not find the right ROM version!"

There is in fact no connection between the content of /proc/cpuinfo and the
SoC ROM version, except in some particular versions of the kernel that were
distributed by Freescale some time ago.

This patch was made for version kobs-ng-3.0.35-4.0.0 that is used in
buildroot-2013.11.

I place this patch in the public domain in the hope that it will be useful,
but there is no warranty. You use this patch at your own risk.
Jonathan Ben-Avraham [email protected]

[allenxh]

Please let us know which kernel exported wrong /proc/cpuinfo, the issue should be fixed in kernel rather than in kobs-ng. To let user choose the ROM version might be risky since the wrong one may corrupt the NAND BBM in worst case.

[hmvp]

In our case an imx28 with linux kernel version 4.1.9

I am not sure if it is the kernel version or the devicetree we are using but this is the contents of proc/cpuinfo

# cat /proc/cpuinfo 
processor   : 0
model name  : ARM926EJ-S rev 5 (v5l)
BogoMIPS    : 226.30
Features    : swp half fastmult edsp java 
CPU implementer : 0x41
CPU architecture: 5TEJ
CPU variant : 0x0
CPU part    : 0x926
CPU revision    : 5

Hardware    : Freescale MXS (Device Tree)
Revision    : 0000
Serial      : 0000000000000000

Edit: ah it comes from using a vanilla kernel:
arch/arm/mach-mxs/mach-mxs.c:

DT_MACHINE_START(MXS, "Freescale MXS (Device Tree)")
    .handle_irq = icoll_handle_irq,
    .init_machine   = mxs_machine_init,
    .init_late      = mxs_pm_init,
    .dt_compat  = mxs_dt_compat,
    .restart    = mxs_restart,
MACHINE_END

So basically kobs-ng is trying to find the cpu family based on a string that is not directly related to the actual cpu (as in: it is not actually trying to read a hardware register or anything)