[U-Boot] mx25pdk does not boot with 3ff46cc42b9d7
Hi, I noticed that mx25pdk (ARM926) does not boot anymore with top of tree U-boot. Doing a git bisect resulted in the following commit as being the guilty one: commit 3ff46cc42b9d73d01c86df904425704410958470 Author: Georges Savoundararadj savou...@gmail.com Date: Tue Oct 28 23:16:11 2014 +0100 arm: relocate the exception vectors This commit relocates the exception vectors. As ARM1176 and ARMv7 have the security extensions, it uses VBAR. For the other ARM processors, it copies the relocated exception vectors to the correct address: 0x or 0x. Signed-off-by: Georges Savoundararadj savou...@gmail.com Acked-by: Albert ARIBAUD albert.u.b...@aribaud.net Cc: Tom Warren twar...@nvidia.com Any ideas? Thanks ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] mx25pdk does not boot with 3ff46cc42b9d7
On 5 Jan 2015, feste...@gmail.com wrote: I noticed that mx25pdk (ARM926) does not boot anymore with top of tree U-boot. Doing a git bisect resulted in the following commit as being the guilty one: commit 3ff46cc42b9d73d01c86df904425704410958470 Author: Georges Savoundararadj savou...@gmail.com Date: Tue Oct 28 23:16:11 2014 +0100 arm: relocate the exception vectors This commit relocates the exception vectors. As ARM1176 and ARMv7 have the security extensions, it uses VBAR. For the other ARM processors, it copies the relocated exception vectors to the correct address: 0x or 0x. Signed-off-by: Georges Savoundararadj savou...@gmail.com Acked-by: Albert ARIBAUD albert.u.b...@aribaud.net Cc: Tom Warren twar...@nvidia.com Any ideas? $ git show 3ff46cc42b9d73d01c86df9044257 /* * Default/weak exception vectors relocation routine * * This routine covers the standard ARM cases: normal (0x), * high (0x) and VBAR. SoCs which do not comply with any of * the standard cases must provide their own, strong, version. */ The code looks correct. However, the imx25 has the HAB and some default vectors set up. Do you assume they overwrite the HAB vectors? For the imx25, the 'V bit = 0' for the physical HAB ROM location, but it can be remapped to 0x. However, there is nothing there (0x) initially and this only makes sense with the MMU enabled. I am not sure what happened before; why it worked. Maybe you could define an empty relocate_vectors() in the imx25 board file and see if everything is ok? I don't think that a write to the ROM code will BUS error? If a write BUS errors, then the empty routine will work/boot. However, u-boot will not be handling the vectors unless we hook in the IRAM at 0x7801, where I guess the ROM code (at address zero) branches too. Fwiw, Bill Pringlemeir. ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] mx25pdk does not boot with 3ff46cc42b9d7
Hi Bill, On Mon, Jan 5, 2015 at 8:25 PM, Bill Pringlemeir bpringlem...@nbsps.com wrote: $ git show 3ff46cc42b9d73d01c86df9044257 /* * Default/weak exception vectors relocation routine * * This routine covers the standard ARM cases: normal (0x), * high (0x) and VBAR. SoCs which do not comply with any of * the standard cases must provide their own, strong, version. */ The code looks correct. However, the imx25 has the HAB and some default vectors set up. Do you assume they overwrite the HAB vectors? For the imx25, the 'V bit = 0' for the physical HAB ROM location, but it can be remapped to 0x. However, there is nothing there (0x) initially and this only makes sense with the MMU enabled. I am not sure what happened before; why it worked. Maybe you could define an empty relocate_vectors() in the imx25 board file and see if everything is ok? I don't think that a write to the ROM code will BUS error? If a write BUS errors, then the empty routine will work/boot. However, u-boot will not be handling the vectors unless we hook in the IRAM at 0x7801, where I guess the ROM code (at address zero) branches too. I have just fixed by using the same approach done on mx27 with its own relocate.S: arch/arm/cpu/arm926ejs/mx27/relocate.S Will submit the patch shortly. Thanks ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
