From dd9ca98f2600000e5c2744735040100b770650e7 Mon Sep 17 00:00:00 2001 From: Paul Gortmaker Date: Fri, 25 Sep 2009 11:14:11 -0400 Subject: sbc8548: reclaim wasted sector in boot flash By nature of being based off the MPC8548CDS board, this board inherited an ENV_SIZE setting of 256k. But since it has a smaller flash device (8MB soldered on), it has a native sector size of 128k, and hence the ENV_SIZE was causing 2 sectors to be used for the environment. By removing the unused sector, we can push TEXT_BASE up closer to the end of address space and reclaim that sector for any other application. This also fixes the mismatch between TEXT_BASE and MONITOR_LEN reported by Kumar earlier. Since this board also supports the ability to boot off the 64MB SODIMM flash, this change is forward looking with that in mind; i.e. the settings for MONITOR_LEN and ENV_SIZE will work when the 512k sectors of the SODIMM flash are used for alternate boot in the future. Signed-off-by: Paul Gortmaker Signed-off-by: Kumar Gala --- doc/README.sbc8548 | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'doc') diff --git a/doc/README.sbc8548 b/doc/README.sbc8548 index d72d97d02..6cbe12f1f 100644 --- a/doc/README.sbc8548 +++ b/doc/README.sbc8548 @@ -63,6 +63,30 @@ a 33MHz PCI configuration is currently untested.) => +Updating U-boot with U-boot: +============================ + +Note that versions of u-boot up to and including 2009.08 had u-boot stored +at 0xfff8_0000 -> 0xffff_ffff (512k). Currently it is being stored from +0xfffa_0000 -> 0xffff_ffff (384k). If you use an old macro/script to +update u-boot with u-boot and it uses the old address, you will render +your board inoperable, and you will require JTAG recovery. + +The following steps list how to update with the current address: + + tftp u-boot.bin + md 200000 10 + protect off all + erase fffa0000 ffffffff + cp.b 200000 fffa0000 60000 + md fffa0000 10 + protect on all + +The "md" steps in the above are just a precautionary step that allow +you to confirm the u-boot version that was downloaded, and then confirm +that it was copied to flash. + + Hardware Reference: =================== -- cgit v1.2.3