u-boot.git/arch/powerpc/cpu/mpc85xx/start.S, branch main

powerpc: Fix 0 vs. r0 confusion in X/D-form instructions

2024-12-30T21:55:07Z

Instructions such as dcbi are in the X-form; they have RA and RB fields and the effective address (EA) is computed as (RA|0)+(RB). In words, this means that if RA is zero, the left-hand side of the addition is zero, otherwise the corresponding GPR is used. r0 can never be used on the left-hand side of a X-form instruction. For D-form instructions such as addis, the Power ISA illustrates this in the instruction pseudo-code: if RA = 0 then RT <- EXTS(SI || 0x0000) else RT <- (RA) + EXIS(SI || 0x0000) In all of these cases, RA=0 indicates the value zero, not register r0. I verified with gazerbeam_defconfig (MPC83xx) and qemu-ppce500_defconfig (MPC85xx) that this patch results in the same machine code. Signed-off-by: J. Neuschäfer

arch: Use CONFIG_XPL_BUILD instead of CONFIG_SPL_BUILD

2024-10-11T17:44:47Z

Use the new symbol to refer to any 'SPL' build, including TPL and VPL Signed-off-by: Simon Glass

powerpc: mpc85xx: use CONFIG_VAL() for SYS_MONITOR_BASE in start.s

2024-07-12T19:07:43Z

Use CONFIG_VAL() for SYS_MONITOR_BASE in start.S so that correct value is used for SPL. Signed-off-by: Marek Mojík Reviewed-by: Marek Behún

mpc85xx: relocate code in non-SPL build

2023-10-28T13:17:55Z

When building a non-SPL image, relocation is needed. This patch restores the old behaviour before commit b35316fb67cb ("Convert CONFIG_SPL_INIT_MINIMAL et al to Kconfig") was only defined if CONFIG_SPL_BUILD was defined. Fixes: b35316fb67cb ("Convert CONFIG_SPL_INIT_MINIMAL et al to Kconfig") Signed-off-by: Martin Fäcknitz

spl: Use SYS_MALLOC_F instead of SYS_MALLOC_F_LEN

2023-10-06T18:38:12Z

Use the new SPL/TPL/VPL_SYS_MALLOC_F symbols to determine whether the malloc pool exists. Signed-off-by: Simon Glass Reviewed-by: Sean Anderson

global: Move remaining CONFIG_SYS_* to CFG_SYS_*

2022-12-05T21:06:08Z

The rest of the unmigrated CONFIG symbols in the CONFIG_SYS namespace do not easily transition to Kconfig. In many cases they likely should come from the device tree instead. Move these out of CONFIG namespace and in to CFG namespace. Signed-off-by: Tom Rini Reviewed-by: Simon Glass

global: Migrate CONFIG_SYS_FSL* symbols to the CFG_SYS namespace

2022-11-10T15:08:55Z

Migrate all of COFIG_SYS_FSL* to the CFG_SYS namespace. Signed-off-by: Tom Rini Reviewed-by: Simon Glass

global: Migrate CONFIG_SYS_MPC8* symbols to the CFG_SYS namespace

2022-11-10T15:08:55Z

Migrate all of COFIG_SYS_MPC* to the CFG_SYS namespace. Signed-off-by: Tom Rini

powerpc: mpc85xx: Add support for generating QorIQ pre-PBL eSDHC boot sector

2022-07-29T11:49:13Z

QorIQ U-Boot binary for SD card booting compiled during build process (either u-boot.bin or u-boot-with-spl.bin) cannot be directly loaded by QorIQ pre-PBL BootROM. Compiled U-Boot binary first needs to be processed by Freescale boot_format tool as described in doc/README.mpc85xx-sd-spi-boot BootROM requires that image on SD card must contain special boot sector. Implement support for generating this special boot sector directly in U-Boot start code. Boot sector needs to be at the beginning of the image, so when compiling only proper U-Boot without SPL then it needs to be in proper U-Boot. When compiling SPL with proper U-Boot then it needs to be only in SPL. Support can be enabled by a new config option FSL_PREPBL_ESDHC_BOOT_SECTOR. Via other two additional options FSL_PREPBL_ESDHC_BOOT_SECTOR_START and FSL_PREPBL_ESDHC_BOOT_SECTOR_DATA it is possible to tune how final U-Boot image could be stored on the SD card. Signed-off-by: Pali Rohár

powerpc: mpc85xx: Simplify jump to _start_cont in flash code

2022-07-03T07:13:51Z

After more patches code for jumping to _start_cont symbol in flash memory involved to code with useless mathematical operations. Currently it does: r3 := CONFIG_SYS_MONITOR_BASE + ABS(_start_cont) - CONFIG_SYS_MONITOR_BASE jump to r3 Which is equivalent of just: r3 := ABS(_start_cont) jump to r3 The purpose of that code is just to jump to _start_code symbol, independently of program counter. So branch must be done to absolute address. Trying to write: ba _start_cont just cause linker error: LD u-boot powerpc-linux-gnuspe-ld.bfd: arch/powerpc/cpu/mpc85xx/start.o: in function `switch_as': (.bootpg+0x4b8): relocation truncated to fit: R_PPC_ADDR24 against symbol `_start_cont' defined in .text section in arch/powerpc/cpu/mpc85xx/start.o make: *** [Makefile:1801: u-boot] Error 1 Probably by the fact that absolute address cannot be expressed by 24-bits. So write the code via mtlr+blr pattern as it was before and load general purpose register with absolute address of the symbol: lis r3,_start_cont@h ori r3,r3,_start_cont@l mtlr r3 blr Seems that gcc and gnu ld linker support symbol@h and symbol@l syntax like number@h and number@l without any problem. And disassembling of compiler u-boot binary proved that lis+ori instructions are called with numbers which represent halves of absolute address of _start_cont symbol. Signed-off-by: Pali Rohár