On Sun, Jan 18, 2015 at 06:38:46PM +0100, Geert Uytterhoeven wrote: > > The boot loader copied the DT to the end of real RAM, not to the end of > the 256 MiB block? Hence the kernel accesses unmapped memory > when checking the FDT header?
actually everything is below 256M since physical memory starts at 0x80000000: U-Boot# printenv loadaddr loadaddr=0x82000000 U-Boot# printenv fdtaddr fdtaddr=0x88000000 U-Boot# load mmc 0:1 ${loadaddr} zimage reading zimage 5694816 bytes read in 318 ms (17.1 MiB/s) U-Boot# load mmc 0:1 ${fdtaddr} am335x-boneblack.dtb reading am335x-boneblack.dtb 29985 bytes read in 10 ms (2.9 MiB/s) U-Boot# setenv bootargs console=ttyO0,115200n8 root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait debug earlyprintk mem=256M U-Boot# bootz ${loadaddr} - ${fdtaddr} Kernel image @ 0x82000000 [ 0x000000 - 0x56e560 ] ## Flattened Device Tree blob at 88000000 Booting using the fdt blob at 0x88000000 Loading Device Tree to 8fff5000, end 8ffff520 ... OK Starting kernel ... hangs there, and after i reset i found the aforementioned oops in __log_buf. Here is without the mem= argument: U-Boot SPL 2015.01 (Jan 16 2015 - 10:20:36) MMC: block number 0x100 exceeds max(0x0) MMC: block number 0x200 exceeds max(0x0) *** Error - No Valid Environment Area found Using default environment U-Boot 2015.01 (Jan 16 2015 - 10:20:36) Watchdog enabled I2C: ready DRAM: 512 MiB MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1 Net: <ethaddr> not set. Validating first E-fuse MAC cpsw, usb_ether Hit any key to stop autoboot: 0 U-Boot# load mmc 0:1 ${loadaddr} zimage reading zimage 5694816 bytes read in 318 ms (17.1 MiB/s) U-Boot# load mmc 0:1 ${fdtaddr} am335x-boneblack.dtb reading am335x-boneblack.dtb 29985 bytes read in 11 ms (2.6 MiB/s) U-Boot# setenv bootargs console=ttyO0,115200n8 root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait debug earlyprintk U-Boot# bootz ${loadaddr} - ${fdtaddr} Kernel image @ 0x82000000 [ 0x000000 - 0x56e560 ] ## Flattened Device Tree blob at 88000000 Booting using the fdt blob at 0x88000000 Loading Device Tree to 8fff5000, end 8ffff520 ... OK Starting kernel ... [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 3.19.0-rc4-00001-g45aa0b7 (flag@luxor) (gcc version 4.8.2 (Ubuntu/Linaro 4.8.2-16ubuntu4) ) #1 SMP Fri Jan 16 10:33:22 CET5 ... -- bye, p. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html