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annotate doc/Modem-operation @ 268:f2e52cab0a73

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abb_inth.c: check all interrupt causes, not just one The original code used if - else if - else if etc constructs, thus the first detected interrupt was the only one handled. However, Iota ITSTATREG is a clear-on-read register, thus if we only handle the first detected interrupt and skip checking the others, then the other interrupts will be lost, if more than one interrupt happened to occur in one ABB interrupt handling cycle - a form of rare race condition. Change the code to check all interrupts that were read in this cycle.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 13 Jun 2021 18:17:53 +0000
parents a62e5bf88434
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1 FC Tourmaline stdmodem functional configuration is equivalent to Magnetite
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2 hybrid. The only intentional diff from Magnetite to Tourmaline in the modem
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3 configuration is the change of Nucleus: Magnetite uses the blob version of
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4 Nucleus which came with TCS211-20070608, whereas Tourmaline uses the source
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5 version of Nucleus by Comrade XVilka. It is essentially a change from an
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6 unknown version of Nucleus to a known one, thus it should generally be
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7 considered an improvement - but as always with such changes, extensive
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8 verification and testing needs to be done in order to ensure that nothing got
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9 broken.
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10
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11 Aside from the one intentional change of Nucleus version, FC Tourmaline is an
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12 entirely new firmware source tree, thus it is always possible that something
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13 could have got broken unintentionally, particularly in rarely-tested areas of
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14 the firmware. Therefore, extensive testing will need to be done before we can
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15 declare Tourmaline stdmodem as officially replacing Magnetite hybrid for stable
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16 modem products.