mirror of
https://github.com/parasyte/alt64
synced 2024-11-15 21:55:03 -05:00
105 lines
2.0 KiB
Plaintext
105 lines
2.0 KiB
Plaintext
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beta9
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rom loading function flow:
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main()
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//init n64, fs, controller
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//joypad loop
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//button (A) -> select rom
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loadrom(disp,name_file);
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//readout rom header
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//check if swapped
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evd_mmcSetDmaSwap(1);
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//dma read file to 0xb0000000 cartspace
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diskRead();
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//change key mapping
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//if (START)
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bootRom();
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//save LAST.CRT for reboot cart-save
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//set fpga to eeprom, sram, flashram
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evd_setSaveType(boot_save);
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//do pif simulation to boot the rom
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simulate_boot(boot_cic, bios_cic);
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cart-save overview:
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before pif simulation the cart_id and cart_savetype is stored in
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LAST.CRT [maybe it's a better solution to use rom filenames
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'cause the cart_id includes no game-version]
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-> bootRom();
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at every start of the menu a function is called that checks
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LAST.CRT, if there is something todo and disable it for next boot
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by setting a flag in that file
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-> backupSaveData(disp);
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if it's a warm boot (reset) the fpga savegame is still there
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-> save_cfg_stat = evd_readReg(REG_SAV_CFG);
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if it's a reset reboot to backup a savegame into a file
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saveTypeToSd(disp, cartID, save_t)
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is called
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it's only for some file operations and calls
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utils.c: getSaveFromCart(stype, cartsave_data)
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to store the savegame into a buffer, which could
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be saved into a file
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some notes:
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eeprom is connected directly to the pif (i2c?)
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and could be read out stable with the libdragon function
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sram/flashram is a serial device that is mapped into
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memory
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it has to be accessed with dma to rdram through the pif
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it's a domain2 device which needs other timing than the cart
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timings:
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PI_BSD_DOM2_XXX_REG
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sram/fram:
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val XXX desc
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05 LAT Latency
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OC PWD Pulse Width
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//sram - 0D
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//fram Animal Forest - 0F
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OD PGS Page Size
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02 RLS Release Duration
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carts/dev-carts:
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40 Latency
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12 Pulse Width
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07 Page Size
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03 Release Duration
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IPL at 0xA6000000:
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40 Latency
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07 Pulse Width
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07 Page Size
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02 Release Duration
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cartidge:
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PI_BSD_DOM1_XXX_REG
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is set with the first word in the header
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e.g. 0x[80]371240 -> 3.7.12.40 ~ 40,12,07,03
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