Re: [U-Boot-Users] [PATCH] Fixup relocation patch.]
From: Txema Lopez [mailto:tlopez@aotek.es] Sent: 14 February 2007 09:01 To: Joakim Tjernlund Cc: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] [PATCH] Fixup relocation patch.]
Joakim Tjernlund wrote:
I wonder, how far off is a fully relocatable u-boot? That
is, burn it anywhere
in flash and start it from there?
Jocke
Hi Jocke, The patch was done precisely for it. You can copy a U-Boot image from an address in flash to another and calculate the new pointers in the GOT an FIXUP sections before do the copy. But you need another change in U-Boot to turn it fully relocatable. U-Boot is hardly joined with the link address TEXT_BASE. You must replace it for a label in U-Boot and change the lines in the U-Boot code where there is a direct or indirect reference (as CFG_MONITOR_BASE) to TEXT_BASE.
Best regards, Txema
Hi Txema
Can you give an example on how to change these references to TEXT_BASE/CFG_MONITOR_BASE?
Regards Jocke
Joakim Tjernlund wrote:
Hi Txema
Can you give an example on how to change these references to TEXT_BASE/CFG_MONITOR_BASE?
Regards Jocke
Hi Jocke,
An example in C code in the board_init_f() function.
#ifdef CFG_BOOT_RELOCATABLE len = (ulong)&_end - (ulong)&_start ; #else len = (ulong)&_end - CFG_MONITOR_BASE; #endif
An example in assembler in the relocate_code function.
#ifdef CFG_BOOT_RELOCATABLE lwz r4, GOT(_start) #else lis r4, CFG_MONITOR_BASE@h /* Source Address */ ori r4, r4, CFG_MONITOR_BASE@l #endif
Anyway, if you are very interested in it I can made a patch for the 1.1.6 version (but merged with our custom board code) and send it to you out of the list to take a look.
Best regards, Txema.
On Wed, 2007-02-14 at 12:27 +0100, Txema Lopez wrote:
Joakim Tjernlund wrote:
Hi Txema
Can you give an example on how to change these references to TEXT_BASE/CFG_MONITOR_BASE?
Regards Jocke
Hi Jocke,
An example in C code in the board_init_f() function.
#ifdef CFG_BOOT_RELOCATABLE len = (ulong)&_end - (ulong)&_start ; #else len = (ulong)&_end - CFG_MONITOR_BASE; #endif
An example in assembler in the relocate_code function.
#ifdef CFG_BOOT_RELOCATABLE lwz r4, GOT(_start) #else lis r4, CFG_MONITOR_BASE@h /* Source Address */ ori r4, r4, CFG_MONITOR_BASE@l #endif
Thanks, now I get it.
Anyway, if you are very interested in it I can made a patch for the 1.1.6 version (but merged with our custom board code) and send it to you out of the list to take a look.
Yes I am interested, but I am leaving for a 2 week vacation soon, so I will get back to you about this.
Thanks again Jocke
Best regards, Txema.
participants (2)
-
Joakim Tjernlund -
Txema Lopez