annotate fcdev3b-hacks/src/romvecs-insert.S @ 629:3231dd9b38c1

armio.c: make GPIOs 8 & 13 outputs driving 1 on all "classic" targets Calypso GPIOs 8 & 13 are pinmuxed with MCUEN1 & MCUEN2, respectively, and on powerup these pins are MCUEN, i.e., outputs driving 1. TI's code for C-Sample and earlier turns them into GPIOs configured as outputs also driving 1 - so far, so good - but TI's code for BOARD 41 (which covers D-Sample, Leonardo and all real world Calypso devices derived from the latter) switches them from MCUEN to GPIOs, but then leaves them as inputs. Given that the hardware powerup state of these two pins is outputs driving 1, every Calypso board design MUST be compatible with such driving; typically these GPIO signals will be either unused and unconnected or connected as outputs driving some peripheral. Turning these pins into GPIO inputs will result in floating inputs on every reasonably-wired board, thus I am convinced that this configuration is nothing but a bug on the part of whoever wrote this code at TI. This floating input bug had already been fixed earlier for GTA modem and FCDEV3B targets; the present change makes the fix unconditional for all "classic" targets. The newly affected targets are D-Sample, Leonardo, Tango and GTM900.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 02 Jan 2020 05:38:26 +0000
parents 8d9298e0823a
children
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1 .text
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2 .code 32
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3 .globl _entry
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4
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5 _entry: adr r0, vectors
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6 ldmia r0, {r1-r7}
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7 mov r0, #0x800000
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8 stmia r0, {r1-r7}
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9 ldr pc, jumpaddr
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11 vectors:
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12 .word 0x4000
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13 .word 0x4004
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14 .word 0x4008
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15 .word 0x400C
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16 .word 0x4010
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17 .word 0x4014
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18 .word 0x4018
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19 jumpaddr:
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20 .word 0x4058