Re: [PATCH 2/5] mips: PMC MSP71xx mips common

[David Daney <ddaney@avtrex.com>]

Marc St-Jean wrote:
> 
> Sergei Shtylyov wrote:
>> Hello.
>>
>> Marc St-Jean wrote:
>>
>>  > [PATCH 2/5] mips: PMC MSP71xx mips common
>>
>>  > Patch to add mips common support for the PMC-Sierra
>>  > MSP71xx devices.
>>
>>  > These 5 patches along with the previously posted serial patch
>>  > will boot the PMC-Sierra MSP7120 Residential Gateway board.
>>
>>  > Signed-off-by: Marc St-Jean <Marc_St-Jean@pmc-sierra.com>
>>
>>  > diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
>>  > index 5da6b0d..d512389 100644
>>  > --- a/arch/mips/Kconfig
>>  > +++ b/arch/mips/Kconfig
>> [...]
>>
>>  > +menu "Options for PMC-Sierra MSP chipsets"
>>  > +     depends on PMC_MSP
>>  > +
>>  > +config PMC_MSP_EMBEDDED_ROOTFS
>>  > +     bool "Root filesystem embedded in kernel image"
>>  > +     select MTD
>>  > +     select MTD_BLOCK
>>  > +     select MTD_PMC_MSP_RAMROOT
>>  > +     select MTD_RAM
>>  > +
>>
>>     Hm, why not just use initramfs?
> 
> I investigated this as part of an earlier thread.  Initramfs
> is not a read-only "ROM" fs but a compressed writable fs.
> Once expanded it will take more memory.
> 
> To lower memory usage for embedded usage of our devices we've
> added a method to embedded cramfs/squashfs file systems into
> the kernel image.
> 

Why not just run the cramfs/squashfs on a standard mdtblock device?

> I've made sure it was unobtrusive and that no linker script
> changes, etc. were required.
> 
>