Dear Wolfgang,
-----Original Message----- From: Wolfgang Denk [mailto:wd@denx.de] Sent: Wednesday, November 03, 2010 6:30 PM To: V, Aneesh Cc: Reinhard Meyer; Albert ARIBAUD; u-boot@lists.denx.de; hs@denx.de Subject: Re: [U-Boot] [RFC] arm926ejs: fix jump to RAM nand_boot
Dear "V, Aneesh",
In message FF55437E1F14DA4BAEB721A458B6701706FD313852@dbde02.ent.ti.com you wrote:
Just curious. Why don't we allocate memory for such needs below
the
u-boot (lower address) like we do for malloc area and stack. This
way
the location where u-boot is relocated will only depend on the
SDRAM=20
size and size of u-boot itself, right?
That would mean that all the memory where U-Boot was located is lost for use in Linux, as we reserve these areas by adjusting the "mem=" boot argument. Allocation of such memory blocks must start at the top, ang do downwards. And U-Boot lies below that, then.
Thanks. It's clear now.
Also, I checked the time it takes to do relocation.
On OMAP4430 with Cortex-A9 at 1GHz and LPDDR2 SDRAM at 400MHz it took a mere 16 ms to do the relocation of u-boot image that was about 146 KB.
I agree with you. Skipping relocation is not worth the complexity.
Best regards, Aneesh