Now that I've brought up FreeBSD via flash, I've discovered that
the second-last 64k seems to be the default firmware board configuration area. Since I have no idea whether uboot uses it or not - and it's prefixed with an atheros eeprom signature (0xaa55), I figure the safest thing to do is mark it as read-only. I've modified my local tplink firmware building program to generate a board configuration section - which is separate to this partition. It's located in the 64k _before_ this particular 64k. The firmware build program from OpenWRT never initialises those values and the firmware images from tplink also leave it 0x0, so I don't currently know what the exact, correct details should be.
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@ -26,7 +26,8 @@ hint.ath.0.eepromaddr=0x1fff1000
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# 128k: uboot
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# 1024k: kernel
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# 4096k: rootfs
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# 2880k: unknown
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# 2816: unknown
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# 64k: board config?
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# 64k: ART
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#
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# from printenv:
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@ -37,8 +38,9 @@ hint.ath.0.eepromaddr=0x1fff1000
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# So:
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# 128k: uboot
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# 2048k: kernel
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# 5888k: rootfs
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# (todo: 64k: config)
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# 5824k: rootfs
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# 64k: config
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# 64k: board config?
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# 64k: ART
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hint.map.0.at="flash/spi0"
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@ -55,19 +57,38 @@ hint.map.1.readonly=1
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hint.map.2.at="flash/spi0"
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hint.map.2.start=0x00220000
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#hint.map.2.end=0x007e0000
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hint.map.2.end=0x007f0000
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hint.map.2.end=0x007c0000
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hint.map.2.name="rootfs"
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hint.map.2.readonly=1
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#hint.map.3.at="flash/spi0"
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#hint.map.3.start=0x007e0000
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#hint.map.3.end=0x007f0000
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#hint.map.3.name="cfg"
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#hint.map.3.readonly=1
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hint.map.3.at="flash/spi0"
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hint.map.3.start=0x007c0000
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hint.map.3.end=0x007d0000
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hint.map.3.name="cfg"
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hint.map.3.readonly=0
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# I'm not sure what this is!
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#
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# It does however start with "55 aa" which is an AR5416 EEPROM
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# magic value, followed by what looks like a set of ethernet
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# MAC addresses, then a bunch of what looks like my local firmware
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# board configuration.
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#
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# For now, I'm going to leave this particular chunk of flash
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# alone.
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#
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hint.map.4.at="flash/spi0"
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hint.map.4.start=0x007f0000
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hint.map.4.end=0x00800000
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hint.map.4.name="art"
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hint.map.4.start=0x007d0000
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hint.map.4.end=0x007e0000
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hint.map.4.name="unknown"
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hint.map.4.readonly=1
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# This is radio calibration section. It is (or should be!) unique
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# for each board, to take into account thermal and electrical differences
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# as well as the regulatory compliance data.
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#
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hint.map.5.at="flash/spi0"
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hint.map.5.start=0x007f0000
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hint.map.5.end=0x00800000
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hint.map.5.name="art"
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hint.map.5.readonly=1
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