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configs/metro-m4: Update README. I have bricked by board 8(

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This commit is contained in:
Gregory Nutt 2018-08-02 06:28:15 -06:00
parent 1d70e7f4b0
commit 88100026fa
2 changed files with 10 additions and 5 deletions
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13
configs/metro-m4/README.txt
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@ -36,8 +36,13 @@ STATUS
2018-08-01: Hardware in hand. Initial attempts to program the board
using a Segger J-Link connected via SWD were unsuccessful. I believe
that the FLASH is locked. See "Unlocking FLASH with J-Link Commander"
below. Unfortunately, this seems to have rendered by board unusable.
Sigh.
below. After unlocking the FLASH, I was able to successfully write
the NuttX image.
Unfortunately, the board seems to have become unusable after the first
NuttX image was written to FLASH. I am unable to connect the JTAG
debugger and so am dead in the water on this unless I get replacement
hardware.
Unlocking FLASH
===============
@ -107,8 +112,8 @@ Unlocking FLASH
To unlock the FLASH memory reserved for the bootloader, we need to
change this field to 111 so that:
1111 01|11 11|01 1010 1001 0010 0011 1001 = F7da9239, or
00804000 = 39 92 DA F7 80 FF EC AE FF FF FF FF FF FF FF FF
11|11 11|10 10|01 1010 1001 0010 0011 1001 = F7da9239, or
00804000 = 39 92 9A FE 80 FF EC AE FF FF FF FF FF FF FF FF
is read.

2
configs/metro-m4/scripts/flash.ld
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@ -40,7 +40,7 @@
MEMORY
{
flash (rx) : ORIGIN = 0x00000000, LENGTH = 512K
sram (rwx) : ORIGIN = 0x20000000, LENGTH = 64K
sram (rwx) : ORIGIN = 0x20000000, LENGTH = 192K
}
OUTPUT_ARCH(arm)