From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <4522-80798@sneakemail.com> Date: Tue, 02 Mar 2004 10:48:42 -0800 From: "Stephen Williams" <612dlag102@sneakemail.com> MIME-Version: 1.0 To: linuxppc-embedded@lists.linuxppc.org Subject: Re: Kernel hangs in early_init References: <20040302085159.1174CC0655@atlas.denx.de> In-Reply-To: <20040302085159.1174CC0655@atlas.denx.de> Content-Type: text/plain; charset=us-ascii; format=flowed Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: Wolfgang Denk wd-at-denx.de |PPC Linux Embedded| wrote: > In message <19122-27221@sneakemail.com> you wrote: > >>I have a PPC405GPr based board w/ 128Meg SDRAM, and I'm building >>kernel 2.4.24 (devel CVS) for it. I also have U-Boot ported to >>it, and I'm using U-Boot as the bootstrap loader. > > ... > >>## Transferring control to Linux (at address 00000000) ... > > > Did you check the FAQ? See > http://www.denx.de/twiki/bin/view/DULG/LinuxHangsAfterUncompressingKernel Good point, I missed that. However, that particular FAQ doesn't seem to apply. I'm using 2.4.24+ (>2.4.5), the CFG_IMMR value doesn't seem to apply (PPC405GPr, not a MPC8xx system) and I double-checked that the bd_t structure matches. Besides, it's nowhere neer trying to access any of the arguments yet. I put some progress checking code in the source to see where it goes, and I see it enters early_init, calls early_init (there is an initial MMU setup active at the time) and calls reloc_offset. However, it never actually seems to *arrive* in reloc_offset. Humm... The MMU comment makes me think. U-Boot is running with the MMU off. The head_4xx.S entry code sets up a temporary MMU mapping that includes the linked kernel address space, but that is only 32meg. The stack at the time is still where U-Boot left it, near the end of the 128Meg memory. Is this something I should address (pardon the pun)? -- Steve Williams "The woods are lovely, dark and deep. steve at XXXXXXXXXX But I have promises to keep, http://www.XXXXXXXXXX and lines to code before I sleep, http://www.picturel.com And lines to code before I sleep." ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/