* [U-Boot] reloacting uboot @ 2009-08-25 19:03 E Robertson 2009-08-25 19:11 ` Wolfgang Denk 0 siblings, 1 reply; 7+ messages in thread From: E Robertson @ 2009-08-25 19:03 UTC (permalink / raw) To: u-boot Hi All, I am using the at91sam9263 device from which the bootstrap code load u-boot to the desired ram address. However, I would like to re-relocate this at the different address based on memory availability. Can / or should this be done? ^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] reloacting uboot 2009-08-25 19:03 [U-Boot] reloacting uboot E Robertson @ 2009-08-25 19:11 ` Wolfgang Denk 2009-08-25 19:28 ` E Robertson 2009-08-25 19:42 ` E Robertson 0 siblings, 2 replies; 7+ messages in thread From: Wolfgang Denk @ 2009-08-25 19:11 UTC (permalink / raw) To: u-boot Dear E Robertson, In message <200908251403.20809.e.robertson.svg@gmail.com> you wrote: > > I am using the at91sam9263 device from which the bootstrap code load u-boot to > the desired ram address. However, I would like to re-relocate this at the > different address based on memory availability. Can / or should this be done? Yes, it can be done, and it should be done. The fact that we don't do it so far is due to the fact that the guys who did the original ARM code found this too complicated (even though they had a working example in the PowerPC code) and not worth the effort. We're suffering since from this misconception. But there is no reason why you would have to copy the code again - just copy it to the correct address right from the beginning, like we do in PowerPC. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de f u cn rd ths, itn tyg h myxbl cd. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] reloacting uboot 2009-08-25 19:11 ` Wolfgang Denk @ 2009-08-25 19:28 ` E Robertson 2009-08-25 20:39 ` Wolfgang Denk 2009-08-25 19:42 ` E Robertson 1 sibling, 1 reply; 7+ messages in thread From: E Robertson @ 2009-08-25 19:28 UTC (permalink / raw) To: u-boot On Tuesday 25 August 2009 02:11:36 pm Wolfgang Denk wrote: > Dear E Robertson, > > In message <200908251403.20809.e.robertson.svg@gmail.com> you wrote: > > I am using the at91sam9263 device from which the bootstrap code load > > u-boot to the desired ram address. However, I would like to re-relocate > > this at the different address based on memory availability. Can / or > > should this be done? > > Yes, it can be done, and it should be done. The fact that we don't do > it so far is due to the fact that the guys who did the original ARM > code found this too complicated (even though they had a working > example in the PowerPC code) and not worth the effort. We're suffering > since from this misconception. > > But there is no reason why you would have to copy the code again - > just copy it to the correct address right from the beginning, like we > do in PowerPC. I don't follow: Yes, but no reason to do so? On the 9263, it's copied once to ram at boot. Are you saying their is no reason to copy it again? If so, yes, in most cases that would be true but I would like to move it again after that initial relocation. Since I've already specified my start address, I wasn't sure about. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] reloacting uboot 2009-08-25 19:28 ` E Robertson @ 2009-08-25 20:39 ` Wolfgang Denk 2009-09-06 22:01 ` Ulf Samuelsson 0 siblings, 1 reply; 7+ messages in thread From: Wolfgang Denk @ 2009-08-25 20:39 UTC (permalink / raw) To: u-boot Dear E Robertson, In message <200908251428.55255.e.robertson.svg@gmail.com> you wrote: > > > In message <200908251403.20809.e.robertson.svg@gmail.com> you wrote: > > > I am using the at91sam9263 device from which the bootstrap code load > > > u-boot to the desired ram address. However, I would like to re-relocate > > > this at the different address based on memory availability. Can / or > > > should this be done? > > > > Yes, it can be done, and it should be done. The fact that we don't do > > it so far is due to the fact that the guys who did the original ARM > > code found this too complicated (even though they had a working > > example in the PowerPC code) and not worth the effort. We're suffering > > since from this misconception. > > > > But there is no reason why you would have to copy the code again - > > just copy it to the correct address right from the beginning, like we > > do in PowerPC. > > I don't follow: Yes, but no reason to do so? You wrote: "re-relocate". This is bogus. Just relocate it once, to the correct address. > On the 9263, it's copied once to ram at boot. Are you saying their is no > reason to copy it again? If so, yes, in most cases that would be true but I > would like to move it again after that initial relocation. Since I've already > specified my start address, I wasn't sure about. Fix the ARM relocating scheme such that it works like in PowerPC: link the image not for a RAM address, but for the address in flash. Then, after determining the RAM size, copy & relocate the code once to RAM. Only one copy. Not two. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de Old programmers never die, they just branch to a new address. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] reloacting uboot 2009-08-25 20:39 ` Wolfgang Denk @ 2009-09-06 22:01 ` Ulf Samuelsson 0 siblings, 0 replies; 7+ messages in thread From: Ulf Samuelsson @ 2009-09-06 22:01 UTC (permalink / raw) To: u-boot Wolfgang Denk skrev: > Dear E Robertson, > > In message <200908251428.55255.e.robertson.svg@gmail.com> you wrote: >>> In message <200908251403.20809.e.robertson.svg@gmail.com> you wrote: >>>> I am using the at91sam9263 device from which the bootstrap code load >>>> u-boot to the desired ram address. However, I would like to re-relocate >>>> this at the different address based on memory availability. Can / or >>>> should this be done? >>> Yes, it can be done, and it should be done. The fact that we don't do >>> it so far is due to the fact that the guys who did the original ARM >>> code found this too complicated (even though they had a working >>> example in the PowerPC code) and not worth the effort. We're suffering >>> since from this misconception. >>> >>> But there is no reason why you would have to copy the code again - >>> just copy it to the correct address right from the beginning, like we >>> do in PowerPC. >> I don't follow: Yes, but no reason to do so? > > You wrote: "re-relocate". This is bogus. Just relocate it once, to the > correct address. > >> On the 9263, it's copied once to ram at boot. Are you saying their is no >> reason to copy it again? If so, yes, in most cases that would be true but I >> would like to move it again after that initial relocation. Since I've already >> specified my start address, I wasn't sure about. > > Fix the ARM relocating scheme such that it works like in PowerPC: link > the image not for a RAM address, but for the address in flash. Then, > after determining the RAM size, copy & relocate the code once to RAM. > Only one copy. Not two. > > Best regards, > > Wolfgang Denk > Very few boards based on the SAM9263 store u-boot in parallel flash and if they are stored in SPI dataflash or in NAND flash it makes little sense to link the u-boot to the flash address. Fix at91bootstrap to load where you want it to load. BR Ulf Samuelsson ^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] reloacting uboot 2009-08-25 19:11 ` Wolfgang Denk 2009-08-25 19:28 ` E Robertson @ 2009-08-25 19:42 ` E Robertson 2009-08-25 20:43 ` Wolfgang Denk 1 sibling, 1 reply; 7+ messages in thread From: E Robertson @ 2009-08-25 19:42 UTC (permalink / raw) To: u-boot On Tuesday 25 August 2009 02:11:36 pm Wolfgang Denk wrote: > Dear E Robertson, > > In message <200908251403.20809.e.robertson.svg@gmail.com> you wrote: > > I am using the at91sam9263 device from which the bootstrap code load > > u-boot to the desired ram address. However, I would like to re-relocate > > this at the different address based on memory availability. Can / or > > should this be done? > > Yes, it can be done, and it should be done. The fact that we don't do > it so far is due to the fact that the guys who did the original ARM > code found this too complicated (even though they had a working > example in the PowerPC code) and not worth the effort. We're suffering > since from this misconception. > > But there is no reason why you would have to copy the code again - > just copy it to the correct address right from the beginning, like we > do in PowerPC. By the way, my reason for doing this is that i want to maintain a proportional memory space available so if I increase the ram size I would like to relocate the boot loader without doing a separate build. Make sense? ^ permalink raw reply [flat|nested] 7+ messages in thread
* [U-Boot] reloacting uboot 2009-08-25 19:42 ` E Robertson @ 2009-08-25 20:43 ` Wolfgang Denk 0 siblings, 0 replies; 7+ messages in thread From: Wolfgang Denk @ 2009-08-25 20:43 UTC (permalink / raw) To: u-boot Dear E Robertson, In message <200908251442.53461.e.robertson.svg@gmail.com> you wrote: > > By the way, my reason for doing this is that i want to maintain a proportional > memory space available so if I increase the ram size I would like to relocate > the boot loader without doing a separate build. Make sense? That's how it's supposed to be. On PowerPC, we will relocate U-Boot to the very end of available RAM. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de It's certainly convenient the way the crime (or condition) of stupidity carries with it its own punishment, automatically admisistered without remorse, pity, or prejudice. :-) -- Tom Christiansen in <559seq$ag1$1@csnews.cs.colorado.edu> ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2009-09-06 22:01 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2009-08-25 19:03 [U-Boot] reloacting uboot E Robertson 2009-08-25 19:11 ` Wolfgang Denk 2009-08-25 19:28 ` E Robertson 2009-08-25 20:39 ` Wolfgang Denk 2009-09-06 22:01 ` Ulf Samuelsson 2009-08-25 19:42 ` E Robertson 2009-08-25 20:43 ` Wolfgang Denk
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