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armlinux.c patch for ramdisk

U-Boot-Users Kyle Harris 2 participants 5 messages Mar 18, 2003 – Mar 19, 2003

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Kyle Harris

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#0 lore raw

Wolfgang,

Please find attached a patch for fixing the problem of mounting a ramdisk. This version differs slightly from the PPC do_bootm_linux() as it uses the load address from the image to relocate the ramdisk in memory.

Kyle.
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#1 lore raw

Dear Kyle,

Quoted 2 lines · in message <[email protected]> you wrote:

Please find attached a patch for fixing the problem of mounting a ramdisk.

Unfortunately it breaks ramdisk support for other ARM boards
(SMD2400, trab).

RAMDisk support is/was working fine on these boards.

Patch rejected.

Best regards,

Wolfgang Denk

Signature · 4 lines
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
You got to learn three things. What's  real,  what's  not  real,  and
what's the difference."           - Terry Pratchett, _Witches Abroad_
#2 lore raw
In reply to Kyle Harris
Quoted 4 lines · In message <[email protected]> you wrote:

Please find attached a patch for fixing the problem of mounting a ramdisk. This version differs slightly from the PPC do_bootm_linux() as it uses the load address from the image to relocate the ramdisk in memory.

Maybe I should be a bit more explicit.

I feel it is unnecessary to copy the ramdisk image to RAM first; the kernel should be able to pick it up directly from flash - this is what we do on the SMDK2400 and TRAB boards, and it helps to reduce boot time, too.

Best regards,

Wolfgang Denk

Signature · 3 lines
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
I have a very small mind and must live with it.    -- Edsger Dijkstra
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#3 lore raw
Quoted 6 lines · Wolfgang Denk
Quoted 4 lines · In message <[email protected]> you wrote:

Please find attached a patch for fixing the problem of mounting a ramdisk. This version differs slightly from the PPC do_bootm_linux() as it uses the load address from the image to relocate the ramdisk in memory.

Quoted 6 lines

Maybe I should be a bit more explicit.

I feel it is unnecessary to copy the ramdisk image to RAM first; the kernel should be able to pick it up directly from flash - this is what we do on the SMDK2400 and TRAB boards, and it helps to reduce boot time, too.

OK. No problem. I'm not sure why the kernel can't handle an initrd_start that points to flash. I'll take another look at it.

Kyle.

#4 lore raw
Quoted 3 lines · In message <[email protected]> you wrote:

OK. No problem. I'm not sure why the kernel can't handle an initrd_start that points to flash. I'll take another look at it.

See the linuxarm module on our CVS server, especially:

Working file: arch/arm/kernel/setup.c
...
description:
----------------------------
revision 1.4
date: 2002/10/26 09:27:17; author: wd; state: Exp; lines: +26 -9 Make ramdisks work if stored in flash memory.
...

Best regards,

Wolfgang Denk

Signature · 3 lines
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
Eureka!                                                 -- Archimedes