From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gilles Chanteperdrix Date: Thu, 17 Mar 2011 21:56:58 +0100 Subject: [U-Boot] Working on u-boot on panda board. In-Reply-To: <4D820DED.4050603@ti.com> References: <4D8201D6.7020308@xenomai.org> <4D820DED.4050603@ti.com> Message-ID: <4D82759A.7060100@xenomai.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Aneesh V wrote: > Hi Gilles, > > On Thursday 17 March 2011 06:13 PM, Gilles Chanteperdrix wrote: >> Hi, >> >> I would like to make some changes to u-boot on pandaboard. Sometimes in >> the past, in u-boot, I could "loadb" a new u-boot binary, then "go" to >> it, and the new version of u-boot would start. This was far from >> perfect, but it made testing small changes possible. This also works >> with the version of u-boot provided on the pandaboard community site. >> >> The magic which made this possible was in the "start.S" file, I see that >> the code changed, but there still seems to be a relocation (somewhat >> more complicated, since it handles ELF relocations), so it seems it >> should work. >> >> So my question is: is this "loadb+go" method still supposed to be >> working, and only broken, somehow, on pandaboard? Or is it no longer >> supposed to be working? > > Couple of things you might want to consider. > * According to the new relocation scheme u-boot should start running > from the address that it is linked to. You must load it to > CONFIG_SYS_TEXT_BASE > * Data cache enabled in U-Boot could be a problem. You will end up > having cache coherency issues unless you flush the caches after loadb. > Better keep them disabled using CONFIG_SYS_NO_DCACHE It works like a charm. Thanks ! -- Gilles.