diff options
Diffstat (limited to 'board/phytec/pcm058/README')
| -rw-r--r-- | board/phytec/pcm058/README | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/board/phytec/pcm058/README b/board/phytec/pcm058/README index 687366b..4b6984c 100644 --- a/board/phytec/pcm058/README +++ b/board/phytec/pcm058/README @@ -37,12 +37,12 @@ not supported. Flashing U-Boot onto an SD card ------------------------------- -After a successful build, the generated SPL and U-boot binaries can be copied +After a successful build, the generated SPL and U-Boot binaries can be copied to an SD card. Adjust the SD card device as necessary: $ sudo dd if=u-boot-with-spl.imx of=/dev/mmcblk0 bs=1k seek=1 -This is equivalent to separately copying the SPL and U-boot using: +This is equivalent to separately copying the SPL and U-Boot using: $ sudo dd if=SPL of=/dev/mmcblk0 bs=1k seek=1 $ sudo dd if=u-boot-dtb.img of=/dev/mmcblk0 bs=1k seek=197 @@ -50,11 +50,11 @@ $ sudo dd if=u-boot-dtb.img of=/dev/mmcblk0 bs=1k seek=197 The default bootscripts expect a kernel fit-image file named "fitImage" in the first partition and Linux ext4 rootfs in the second partition. -Flashing U-boot to the SPI Flash, for booting Linux from NAND +Flashing U-Boot to the SPI Flash, for booting Linux from NAND ------------------------------------------------------------- -The SD card created above can also be used to install the SPL and U-boot into -the SPI flash. Boot U-boot from the SD card as above, and stop at the autoboot. +The SD card created above can also be used to install the SPL and U-Boot into +the SPI flash. Boot U-Boot from the SD card as above, and stop at the autoboot. Then, clear the SPI flash: @@ -64,13 +64,13 @@ Then, clear the SPI flash: Load the equivalent of u-boot-with-spl.imx from the raw MMC into memory and copy to the SPI. The SPL is expected at an offset of 0x400, and its size is maximum 392*512-byte blocks in size, therefore 0x188 blocks, totaling 0x31000 -bytes. Assume U-boot should fit into 640KiB, therefore 0x500 512-byte blocks, +bytes. Assume U-Boot should fit into 640KiB, therefore 0x500 512-byte blocks, totalling 0xA0000 bytes. Adding these together: => mmc read ${loadaddr} 0x2 0x688 => sf write ${loadaddr} 0x400 0xD1000 -The SPL is located at offset 0x400, and U-boot at 0x31400 in SPI flash, as to +The SPL is located at offset 0x400, and U-Boot at 0x31400 in SPI flash, as to match the SD Card layout. This would allow, instead of reading from the SD Card above, with networking and TFTP correctly configured, the equivalent of: @@ -84,7 +84,7 @@ image) and "root" (which contains a ubifs root filesystem). The "bootm_size" variable in the environment -------------------------------------------- -By default, U-boot relocates the device tree towards the upper end of the RAM, +By default, U-Boot relocates the device tree towards the upper end of the RAM, which kernels using CONFIG_HIGHMEM=y may not be able to access during early -boot. With the bootm_size variable set to 0x30000000, U-boot relocates the +boot. With the bootm_size variable set to 0x30000000, U-Boot relocates the device tree to below this address instead. |